lsof

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1. 4.99.7 Jun 16, 2026 · release notes

   lsof 4.99.7 adds JSON and JSON Lines output formats and displays UDPUDPA network protocol that sends individual messages without guaranteeing delivery or order. Applications trade built-in reliability for less overhead and can add their own recovery. connection state via -T.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.99.7 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.99.7

   └──▷ TRY IT
   Inspect UDP socket connection states on Linux to identify sockets stuck in unexpected states.
   copy

   $ lsof -i UDP -T s

   • Adds -J flag for JSON output wrapping process and file information in a structured envelope.
   • Adds -j flag for JSON Lines output where each line is a JSON object representing a file descriptor.
   • Enables UDP socket connection-state display on Linux via the existing -T option.

   3 details in Everything

2. 4.99.7 Jun 16, 2026 · issue 001

   lsof 4.99.7 adds JSON and JSON Lines output formats and Linux UDPUDPA network protocol that sends individual messages without guaranteeing delivery or order. Applications trade built-in reliability for less overhead and can add their own recovery. connection-state display.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.99.7 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.99.7

   └──▷ TRY IT
   Parse all open files for a process in a pipeline using jq — JSON Lines mode streams one object per FD without needing to parse a full JSON document.
   copy

   $ lsof -j -p 1234 | jq 'select(.type == "REG") | .name'

   Capture a full structured snapshot of open files system-wide for offline analysis or ingestion into a SIEMSIEMSecurity information and event management, collecting logs from many systems and correlating events to find suspicious activity. Analysts use it to investigate alerts and incidents..
   copy

   $ lsof -J > open_files_snapshot.json

   Show UDP socket connection states on Linux to identify established vs. unconnected UDP flows during an incident.
   copy

   $ lsof -i UDP -T

   • Adds -J flag for structured JSON output, wrapping process and file descriptor information in a JSON envelope.
   • Adds -j flag for JSON Lines output, emitting one JSON object per file descriptor — ideal for streaming pipelines.
   • Enables UDP socket connection-state display on Linux via the existing -T option.

   3 details in Everything

3. 4.99.6 Mar 4, 2026 · release notes

   lsof 4.99.6 adds NETPOLICY FD parsing on Darwin, NFS ESTALE unlinked-file selection on Linux, and AIX filename capture.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.99.6 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.99.6

   • Adds parsing and printing of NETPOLICY file descriptor type on Darwin.
   • Treats NFS ESTALE file descriptors as unlinked on Linux, enabling them to be selected with the +L flag.
   • Adds AIX platform-specific process_file() implementation with filename capture.
   • File name is now properly saved in liblsof on Darwin.

   4 details in Everything

4. 4.99.1 Dec 16, 2023 · release notes

   lsof 4.99.1 adds --disable-liblsof configure option to omit liblsof installation.

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.99.1 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.99.1

5. 4.99.0 Nov 10, 2023 · release notes

   First alpha release of liblsof for C library access, plus OpenBSD platform support

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.99.0 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.99.0

   • Introduces an alpha version of liblsof, allowing users to access lsof functionality via C functions instead of spawning a subprocess and parsing output.
   • Adds a new folder separating the OpenBSD dialect to support platforms that disallow kernel memory access, requiring a switch to user mode API.

   2 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !On macOS, the /dev/kmem backend is removed and replaced with libproc, which may affect older macOS compatibility.
6. 4.98.0 Jan 22, 2023 · release notes

   lsof 4.98.0 adds human-readable size display and root-only file listing security options

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.98.0 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.98.0

   • Adds -H switch to print file sizes in human-readable format (e.g., 123.4K)
   • Adds --enable-security configure option to restrict listing all open files to the root user only
   • Adds --enable-no-sock-security configure option to allow listing socket files even when --enable-security is active

   3 details in Everything

7. 4.97.0 Jan 17, 2023 · release notes

   Adds an experimental Autotools-based build system for lsof

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.97.0 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.97.0

   └──▷ BREAKING ON UPGRADE

   • !Removes support for the decof/du/tru64 operating systems
   • !Removes support for the openstep/nextstep operating systems
8. 4.95.0 Apr 27, 2022 · release notes

   Adds -Q option to control exit status and improves startup performance on Linux via close_range(2).

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.95.0 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.95.0

   • Adds the -Q command-line flag to adjust lsof's exit status when no search items are found, allowing it to return 0 instead of the default 1.
   • Uses the Linux close_range(2) syscall instead of repeated close() calls during startup, significantly reducing initialization time on kernels 5.9+.

   2 details in Everything

9. 4.94.0 Nov 10, 2020 · release notes

   lsof 4.94 adds -d fd pseudo-selector for all numeric fds, POSIXPOSIXA family of standards for operating-system interfaces, including process, file and shell behavior. Software that uses these interfaces is easier to move between compatible systems. MQ support, +fg O_PATH/CLOEXEC/TMPF decoding, and -r c<N> stop limit

   └──▷ GET THIS VERSION

   copy

   $ git clone --branch 4.94.0 https://github.com/lsof-org/lsof.git
   # already have the repo? check out this version:
   $ git checkout 4.94.0

   └──▷ USE IT
   Inspect all numeric file descriptors for the current process, ignoring special names like cwd or txt.
   shell copy

   ./lsof -p $$ -a -d fd

   Limit a continuous monitoring loop to exactly 10 iterations to prevent runaway scripts.
   shell copy

   ./lsof -r c10

   • Adds fd as a pseudo file descriptor name to the -d option to select all numbered file descriptors
   • Adds c<N> specifier to the -r option to stop iteration when count reaches N
   • Adds decoding of O_PATH flag in +fg option
   • Adds decoding of O_CLOEXEC flag as CX in +fg option
   • Adds decoding of O_TMPFILE flag as TMPF in +fg option

   +6 more show less

   • Adds Linux display of POSIX message queue endpoint information with +|-E option
   • Enables printing connection state for unix domain sockets (LISTEN, UNCONNECTED, CONNECTING, CONNECTED, DISCONNECTING, UNKNOWN)
   • Turns off unix domain socket state printing with the -T option
   • Shows pid monitored by a pidfd in [pidfd:%d] format in output
   • Enumerates fds monitored by an eventpoll fd in [eventpoll:<fd0>,<fd1>,...,<fdn>] format in output
   • Makes -Fo option work for printing file offset for regular files

   11 details in Everything

10. 4.90 Feb 14, 2018 · release notes

    lsof 4.90 adds -K i flag to ignore tasks and enhances Linux pseudoterminal reporting

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.90 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.90

    • Adds -K i flag to ignore tasks during file listing
    • Enhances +|-E option for Linux pseudoterminal endpoint processing

    2 details in Everything

11. 4.88 Oct 13, 2014 · release notes

    lsof 4.88 adds +E option for Linux endpoint info and drops Solaris support

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.88 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.88

    • Adds +E and -E options to display endpoint information on Linux.
    • Adds support for FreeBSD 11, including tmpfs file system support.
    • Adds protocol name support for Linux RDMARDMAA networking technique that lets one machine read or write another machine's memory directly over a fabric like InfiniBand or RoCE, bypassing both CPUs and OS kernels, giving cyber tools near-zero-latency, high-throughput data transfer. and CRYPTO.

    3 details in Everything

12. 4.87 Jan 2, 2013 · release notes

    lsof 4.87 adds anonymous inode file system support, ICMP socket reporting, and FreeBSD thread/Ki_numthreads detection.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.87 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.87

    • Adds support for Linux anon_inodefs file systems to display files backed by anonymous inodes
    • Adds support for FreeBSD builds using the clang compiler

    2 details in Everything

13. 4.86 Apr 10, 2012 · release notes

    lsof 4.86 adds support for Linux SCTPSCTPA transport-layer protocol (RFC 4960) maintained by the IETF that delivers messages with optional ordering and built-in multi-homing, giving cyber tools reliable framing without TCP's head-of-line blocking. sockets, FreeBSD 10, Mac OS X Lion, and fixes NFS duplicate device handling.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.86 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.86

    • Adds SCTP socket file support to the lsof command line utility on Linux systems
    • Enables detection of open files on FreeBSD 8.3 and FreeBSD 10 platforms
    • Extends platform coverage to Mac OS X 10.7 (Lion) in the lsof build
    • Improves accuracy for Linux NFS mounts by resolving issues with duplicate device numbers

    4 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !AIX is no longer supported on any versions of that operating system.
14. 4.85 Sep 27, 2011 · release notes

    lsof 4.85 adds Linux +|-e option to exempt file systems from blocking kernel calls and Netlink protocol support

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.85 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.85

    • Adds the +|-e option for Linux to exempt file systems named by path from blocking stat(2), lstat(2) or readlink(2) calls that might hang in the kernel.
    • Adds support for Linux Netlink protocol, allowing lsof to display network sockets using this protocol.

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !FreeBSD 7.x is no longer supported.
15. 4.84 Jul 29, 2010 · release notes

    lsof 4.84 adds -K flag for Linux task reporting and HASTASKS support.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.84 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.84

    • -K

    1 detail in Everything

16. 4.81 Oct 21, 2008 · release notes

    lsof 4.81 adds -c^ exclusion and -stcp|ud state filtering options for faster Internet file selection.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.81 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.81

    • Adds -c^<command> option to lsof to exclude files owned by specified commands during scanning
    • Adds -stcp|ud>:[state1,state2,...] or -stcp|ud>:^[state1,state2,...] options to filter Internet files by TCPTCPA network protocol that delivers a reliable, ordered stream of bytes between two endpoints. It detects lost data and retransmits it./UDPUDPA network protocol that sends individual messages without guaranteeing delivery or order. Applications trade built-in reliability for less overhead and can add their own recovery. state (e.g., LISTEN, CLOSE_WAIT)
    • Implements performance enhancements for socket file operations on Linux and PSTAT-based HP-UX

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Reduces supported AIX versions; older than AIX 5.3 is no longer tested or supported
    • !Relies on HASTCPUDPSTATE definition in dialect-specific machine.h header to enable new TCP/UDP state options
17. 4.79 Apr 15, 2008 · release notes

    lsof 4.79 adds Linux /proc/<PID>/fdinfo support and repeat-mode strftime formatting

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.79 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.79

    • LINUX_HASSELINUX environment variable added to unconditionally enable or inhibit SELinuxSELinuxA mandatory access control system built into the Linux kernel, maintained by the NSA and Red Hat, that enforces fine-grained policies restricting what processes can access, even if they run as root. support in lsof

    1 detail in Everything

18. 4.77 Apr 10, 2006 · release notes

    lsof 4.77 adds -X option for Solaris cached v_node paths and improved FreeBSD random seed generation.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.77 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.77

    • Adds -X option support for Solaris 10 and above to report cached v_node path names for unlinked files followed by (deleted)
    • Improves cached vnode path name accuracy by appending "(?)" to the end of questionable paths
    • Adds command name length checking to as many dialects as possible (including Linux) for the -c option

    3 details in Everything

19. 4.76 Aug 30, 2005 · release notes

    lsof 4.76 adds partial listen queue length to -Tf and solaris port/ctfs support

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.76 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.76

    • Adds partial listen queue length to socket options when using the -Tf flag.
    • Adds support for Solaris 10 Port Files and CTFS files (incomplete inode/size/link count).
    • Enables lsof to process Linux map file names containing embedded spaces.

    3 details in Everything

20. 4.75 May 16, 2005 · release notes

    lsof 4.75 adds negation to -g/-p, new -X option for Linux, and supports FreeBSD/NetBSD/AIX platforms

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.75 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.75

    • Adds -X option on Linux to inhibit reading /proc/net/tcp* and /proc/net/udp* files
    • Adds negation forms to -g (PGID) and -p (PID) list values for targeted exclusion
    • Enables FreeBSD 5.4 support
    • Enables NetBSD 2.99.12 support
    • Enables IPv6IPv6The current version of the Internet Protocol, standardized by the IETF, using 128-bit addresses to replace the exhausted IPv4 space. Cyber tools target it because modern networks run dual-stack or IPv6-only. support for HP-UX > 11

    +1 more show less

    • Adds support for SCO OSR 6.0.0 and UnixWare 7.1.4

    6 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Drops claimed support for DEC OSF/1 and Digital UNIX (last tested revision was 4.74)
    • !Drops support for OpenUNIX 8
21. 4.71 Mar 11, 2004 · release notes

    Adds -x for symlink/ mount crossing, socket option reporting, and -z for Solaris 10 zones

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.71 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.71

    • Added the -x [fl] cross-over option to enable +d and +D processing to cross over symbolic links and/or file system mount points.
    • Added support for optional reporting of socket options, socket states and TCPTCPA network protocol that delivers a reliable, ordered stream of bytes between two endpoints. It detects lost data and retransmits it. flags for AIX, Darwin, BSDI, Digital UNIX/Tru64, FreeBSD, HP-UX, NetBSD, OpenBSD, OPENSTEP, OpenUNIX, SCO OpenServer, Solaris, and UnixWare.
    • Added a -z [z] option to Solaris 10 lsof to enable listing of zone name and select processes/files from specified zones.

    3 details in Everything

22. 4.70 Jan 16, 2004 · release notes

    This release enhances cyber tooling portability and platform coverage for lsof 4.70 by adding IPv6IPv6The current version of the Internet Protocol, standardized by the IETF, using 128-bit addresses to replace the exhausted IPv4 space. Cyber tools target it because modern networks run dual-stack or IPv6-only. socket support on Linux and LFS visibility for NetBSD/OpenBSD.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.70 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.70

    • Adds raw IPv6 support to the Linux build of lsof.
    • Adds log-structured file system (LFS) support for NetBSD and OpenBSD.

    2 details in Everything

23. 4.68 Jun 18, 2003 · release notes

    lsof 4.68 adds preliminary SAM-FS support and upgrades EXT2FS/UFS for new inode structures.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.68 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.68

    • Adds preliminary (and incomplete) SAM-FS file system support to Solaris lsof
    • Upgrades EXT2FS and UFS support for NetBSD and OpenBSD to handle new inode information and fast UFS1/UFS2 file systems

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Disables AIX AFS support in the Configure script for AIX versions above 4.3.3.0 or AIX AFS versions above 3.5
24. 4.67 Mar 27, 2003 · release notes

    lsof 4.67 adds +c <width> for COMMAND column width and kernel event queue support on FreeBSD/NetBSD/OpenBSD

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.67 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.67

    • Adds the +c <width> CLI option to change the maximum output width of the COMMAND column, allowing values other than the default CMDL defined in lsof.h
    • Adds kernel event queue file support for FreeBSD, NetBSD, and OpenBSD, enabling detection of files via the OS kernel's event queue mechanism

    2 details in Everything

25. 4.64 Jun 26, 2002 · release notes

    lsof 4.64 adds exclusion list to -d flag, nullfs support on BSDs, and Solaris 9 FCS/Solaris fd fs improvements

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.64 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.64

    • Adds ^ prefix to the -d option to denote an exclusion list for file descriptors
    • Adds nullfs support for FreeBSD, NetBSD, and OpenBSD
    • Adds Solaris 9 FCS specific DNLC code and updates dnode.c for the so_so structure change
    • Adds Solaris fd file system support

    4 details in Everything

26. 4.63 Apr 23, 2002 · release notes

    Adds HPUX_BOOTFILE environment variable and defense against stdio descriptor attack

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.63 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.63

    • Adds the HPUX_BOOTFILE environment variable to control HP-UX kernel configuration detection during the Configure script run.
    • Enables HP-UX 10.30 and 11.00 to report open NFS file link counts.
    • Enables HP-UX 11.11 to stat(2) large files.

    3 details in Everything

27. 4.62 Mar 7, 2002 · release notes

    lsof 4.62 adds block node reporting outside /dev and new kernel symbol defaults for NetBSD/OpenBSD

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.62 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.62

    • Changes NetBSD lsof source selection logic to prefer getbootfile(3) over /netbsd for kernel symbol resolution
    • Changes OpenBSD lsof source selection logic to prefer /dev/ksyms over /bsd for kernel symbol resolution

    2 details in Everything

28. 4.61 Jan 22, 2002 · release notes

    Adds large file support for Linux and fixes NetBSD/OpenBSD build without system source.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.61 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.61

    • Makes Linux lsof capable of handling and reporting file sizes greater than 32 bits.
    • Modifies NetBSD and OpenBSD Configure stanzas so that lsof can be built when there is no system source tree (e.g., /usr/src/sys).

    2 details in Everything

29. 4.59 Oct 20, 2001 · release notes

    lsof 4.59 adds IPv6IPv6The current version of the Internet Protocol, standardized by the IETF, using 128-bit addresses to replace the exhausted IPv4 space. Cyber tools target it because modern networks run dual-stack or IPv6-only. selector to -i, raw hex device field r, and OpenUNIX 8 support.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.59 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.59

    • Adds IP version selector to the -i option parameters.
    • Adds new output field r for raw device number in hex (excluded from -F/-F0 output).

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Terminated lsof support for PTXPTXA low-level parallel thread execution ISA and virtual machine defined by NVIDIA, used as an intermediate representation for GPU code so tools can compile, inspect, or instrument GPU kernels without targeting specific hardware generations..
30. 4.58 Sep 13, 2001 · release notes

    lsof 4.58 adds new socket and OS type detections plus -C option for HP-UX PSTAT builds

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.58 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.58

    • Adds detection of OSR Xenix Shared Data and Semaphore file types for OpenServer systems.
    • Enables processing of the -C option for PSTAT-based HP-UX lsof builds.

    2 details in Everything

31. 4.57 Jul 19, 2001 · release notes

    lsof 4.57 adds locale support for character classification and URLs in help output.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.57 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.57

    • Help (-h) and version (-v) output now include URLs to the lsof FAQ and man page

    1 detail in Everything

32. 4.56 May 3, 2001 · release notes

    Adds in-kernel UNIX socket support for UnixWare 7.1.1+ and TCPTCPA network protocol that delivers a reliable, ordered stream of bytes between two endpoints. It detects lost data and retransmits it./IP info for HP-UX telnetd multiplexor

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.56 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.56

    • Added support for UnixWare 7.1.1 and above in-kernel UNIX sockets

    1 detail in Everything

33. 4.55 Feb 15, 2001 · release notes

    lsof 4.55 adds support for deleted files in /proc/PID/maps and regex command name selection.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.55 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.55

    • -c option now accepts a regular expression to select processes by command name.
    • Support for files in /proc/<PID>/maps that have been deleted.

    2 details in Everything

34. 4.53 Dec 6, 2000 · release notes

    lsof 4.53 adds Apple Darwin / Mac OS X 1.2 port and new Configure handling for AIX j2_lock.h.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.53 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.53

    • Added Apple Darwin / Mac OS X 1.2 platform support
    • Added j2_lock.h to distribution with automatic detection during configuration

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Removed SunOS 4.1.x support
    • !Removed Linux 2.0.x /dev/kmem support
    • !Dropped claims of support for all UnixWare versions except 7.1.0
    • !Dropped claims of support for all SCO OpenServer versions except 5.0.5
35. 4.52 Nov 8, 2000 · release notes

    lsof 4.52 adds PSTAT-based HP-UX, AIX 5L, OpenBSD 2.8, and UnixWare 7.x support

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.52 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.52

    • Adds PSTAT-based lsof for HP-UX 11 using the pstat(2) interface (sources in lsof_4.52/dialects/hpux/pstat)
    • Adds Configure support for AIX 5L (Monterey/Itanium) via the aix abbreviation
    • Adds Configure support for OpenBSD 2.8
    • Adds large file, CDFS, and DOSFS support for UnixWare 7.x
    • Adds sockfs to the mount scan exemption list for /proc-based Linux lsof

    +2 more show less

    • Adds Tru64 5.x CFS support providing cached file attribute information
    • Adds Solaris 9 text file support

    7 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Terminates support for Pyramid, SunOS 4.1.x, and Ultrix platforms
36. 4.50 Jun 29, 2000 · release notes

    lsof 4.50 adds NetBSD alpha support, OpenBSD 2.7 configure handling, and Solaris VxFS QIO file support.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.50 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.50

    • Adds NetBSD alpha test host support.
    • Enables Configure script to handle OpenBSD 2.7.
    • Adds support for Solaris VxFS QIO files.

    3 details in Everything

37. 4.49 Apr 3, 2000 · release notes

    lsof 4.49 adds OpenBSD UVM support, AIX >2GB memory handling, FreeBSD KAME IPv6IPv6The current version of the Internet Protocol, standardized by the IETF, using 128-bit addresses to replace the exhausted IPv4 space. Cyber tools target it because modern networks run dual-stack or IPv6-only., and new HASPRIVPRIPP configure check.

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    $ git clone --branch 4.49 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.49

    • Adds HASPRIVPRIPP configuration option to the Configure script for privilege checks.
    • Adds support for OpenBSD UVM virtual memory in the build process.
    • Enables KAME IPv6 support on FreeBSD via updated KAME support logic.
    • Extends AIX compatibility to systems with more than 2GB of memory.

    4 details in Everything

38. 4.47 Nov 29, 1999 · release notes

    Adds -R and -F field output selector behavior and Solaris 8 mntfs support.

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    $ git clone --branch 4.47 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.47

    • -FR field output specification now selects the optional PPID field without requiring a separate -R option
    • Added support for the mnt file system (mntfs or /etc/mnttab) on Solaris 8

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Scripts that parse all field output may require revision due to the change in -FR behavior.
39. 4.46 Oct 23, 1999 · release notes

    lsof 4.46 adds Solaris 8 Beta/refresh support and libc5 /dev/kmem circumvention for Linux

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    $ git clone --branch 4.46 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.46

    • Adds a libc5 library /dev/kmem-based Linux lsof circumvention.
    • Enables support for OpenBSD 2.6.
    • Enables support for BSDI BSD/OS 4.1.
    • Adds support for INRIA IPv6IPv6The current version of the Internet Protocol, standardized by the IETF, using 128-bit addresses to replace the exhausted IPv4 space. Cyber tools target it because modern networks run dual-stack or IPv6-only. to NetBSD.
    • Added support for Solaris 8 Beta and Beta refresh.

    5 details in Everything

40. 4.43 May 11, 1999 · release notes

    Adds FILE-FLAG and link count output via new flags +f[G] and +L

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    $ git clone --branch 4.43 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.43

    • Added +f[gG] flag to include the FILE-FLAG column (open flags) in output.
    • Added +L option to display and filter by file link counts.

    2 details in Everything

41. 4.41 Feb 27, 1999 · release notes

    lsof 4.41 adds LSOF_CINFO, LSOF_CC, and LSOF_CCV env vars for configure control and FreeBSD 3.1/4.0 support

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    $ git clone --branch 4.41 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.41

    • Adds LSOF_CINFO string to Configure to propagate a CINFO string into the lsof -v output via a #define LSOF_CINFO in version.h
    • Adds LSOF_CC environment variable for configuring the compiler path during build
    • Adds LSOF_CCV environment variable for specifying the compiler version during build

    3 details in Everything

42. 4.40 Jan 25, 1999 · release notes

    Adds +D and +d directory search options for lsof

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    $ git clone --branch 4.40 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.40

    • Adds +D <dir> option to search the entire directory tree including subdirectory branches
    • Adds +d <dir> option to search only <dir> and its contents without descending into subdirectories
    • Supports LINUX_BASE environment variable to force Linux Configure stanza to use /proc or /dev/kmem source base

    3 details in Everything

43. 4.35 Jul 17, 1998 · release notes

    lsof 4.35 adds configurable kernel identity check, Solaris UNIX socket details and HP-UX NFS3 support

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    $ git clone --branch 4.35 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.35

    • Adds HASKERNIDCK build-time option to control kernel identity checking, configurable via the Customize script
    • Expands the NAME column for Solaris UNIX domain sockets with clone device path names, enabling search by this path
    • Adds support for HP-UX NFS3 files and completes the 64-bit kernel port for HP-UX 11

    3 details in Everything

44. 4.30 Apr 9, 1998 · release notes

    lsof 4.30 adds Linux Alpha support and new TIMEVAL_LSOF config for glibc evasion.

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    $ git clone --branch 4.30 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.30

    • Adds TIMEVAL_LSOF global symbol (default timeval) to allow the /dev/kmem-based Linux lsof to set its private glibc timeval name
    • Adds platform support for Alpha on the /dev/kmem-based Linux lsof

    2 details in Everything

45. 4.27 Mar 6, 1998 · release notes

    Adds repeat mode with +r and adds HP-UX 11.0 support

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    $ git clone --branch 4.27 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.27

    • Adds the +' prefix to the -r' option (i.e., +r) for conditional repeat mode that exits immediately if no open files are listed during a cycle.
    • Adds support for HP-UX 11.0 platform.

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Removed support for RISC/os; its test system is no longer available.
46. 4.26 Feb 17, 1998 · release notes

    lsof 4.26 adds +f/-f flags to control file system name argument interpretation

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    $ git clone --branch 4.26 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.26

    • Adds +f flag to force path arguments to be considered as file system names regardless of mount table matches
    • Adds -f flag to force path arguments to be considered as simple files rather than file system names
    • Improves -V message for files and file systems with no open files and adds reporting of /proc search failures

    3 details in Everything

47. 4.25 Feb 7, 1998 · release notes

    lsof 4.25 adds configurable decimal digit size argument to -o option for offset formatting control

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    $ git clone --branch 4.25 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.25

48. 4.22 Dec 15, 1997 · release notes

    lsof 4.22 adds +|-M for portmapper info and extends +|- prefix to more options.

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    $ git clone --branch 4.22 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.22

    • Adds + and - prefix support to most lsof options, allowing explicit enable (+) or disable (-) of flags like -b, -C, -n, -P.
    • Adds +|-M option to control reporting of portmapper registration information in square brackets after TCPTCPA network protocol that delivers a reliable, ordered stream of bytes between two endpoints. It detects lost data and retransmits it./UDPUDPA network protocol that sends individual messages without guaranteeing delivery or order. Applications trade built-in reliability for less overhead and can add their own recovery. port or service name.
    • Changes -w option syntax to +|-w to match the new +|- prefix convention and stabilize compile-time behavior.

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !The -w option now requires a + or - prefix to explicitly set width suppression; relying on the bare -w default behavior may change if the default state shifts based on compile flags.
49. 4.21 Dec 1, 1997 · release notes

    lsof 4.21 adds -R for PGID reporting, FreeBSD root directory support, and BSDI/Irix build enablements.

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    copy

    $ git clone --branch 4.21 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.21

    • Enables FreeBSD root directory reporting for the output of lsof
    • Allows configuring for BSDI BSD/OS 4.0 during the build process
    • Supports replacing scoff_t with off64_t for IRIX 5.3 systems with NFS kernel patch 1477

    3 details in Everything

50. 4.20 Nov 11, 1997 · release notes

    Adds support for Reliant UNIX Mesh IPCIPCInter-process communication, ways for separate programs to exchange data or signals. Examples include pipes, sockets and shared memory. files and AdvFS path lookups in Digital UNIX.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.20 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.20

51. 4.18 Oct 25, 1997 · release notes

    lsof 4.18 adds dynamic print columns and 64-bit file size/offset support

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    copy

    $ git clone --branch 4.18 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.18

    • Added Configure recognition for OpenBSD 2.2 platform support
    • Added special types and print specification modifiers for file size and offset to handle UNIX dialects with 64 bit sizes and offsets

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Output format changes: lines are generally shorter, less blank space between columns, and no spaces between device number elements (only commas) due to dynamic print columns.
52. 4.17 Oct 14, 1997 · release notes

    Adds -V option for verbose search result reporting in lsof 4.17

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.17 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.17

53. 4.16 Sep 25, 1997 · release notes

    lsof 4.16 adds -T flag to display TCPTCPA network protocol that delivers a reliable, ordered stream of bytes between two endpoints. It detects lost data and retransmits it./TPI queue lengths and window sizes in the NAME column

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    copy

    $ git clone --branch 4.16 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.16

    • Adds -T option to select or de-select TCP/TPI info reporting in output
    • Includes scripts/identd.perl5, a Perl 5 identd server implementation using lsof

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Service name arguments with embedded minus signs at the start of a range are no longer supported due to processor update
54. 4.15 Aug 15, 1997 · release notes

    lsof 4.15 adds Solaris VxFS configuration, socket state TCO/TPI support

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    $ git clone --branch 4.15 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.15

    • Added improved Solaris VxFS configuration and handling
    • Added socket state -- TCO or TPI -- for socket files

    2 details in Everything

55. 4.12 Jun 24, 1997 · release notes

    lsof 4.12 adds conditional Pyramid OBJFS support and enhances the Configure script for cross-configuration.

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    $ git clone --branch 4.12 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.12

    • Adds a new documentation file 00XCONFIG that describes the process for cross-configuration of lsof.
    • Enhances the Configure script to enable cross-configuration of lsof, based on suggestions from Marty Leisner.

    2 details in Everything

56. 4.09 Jun 1, 1997 · release notes

    lsof 4.09 adds new kernel name cache module rnmh.c to read BSD-form hashed entries

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    $ git clone --branch 4.09 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.09

57. 4.07 May 12, 1997 · release notes

    Adds OpenBSD EXT2FS support and activates /kern filesystem detection for NetBSD in lsof 4.07

    └──▷ GET THIS VERSION

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    $ git clone --branch 4.07 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.07

    • Configure now detects and enables /kern file system support for NetBSD when kern_target structure is found.
    • Adds OpenBSD platform support for scanning EXT2FS file systems.

    2 details in Everything

58. 4.03 Apr 7, 1997 · release notes

    lsof 4.03 introduces build-time configuration via WARNINGSTATE and expands platform support for HP-UX, SCO, PTXPTXA low-level parallel thread execution ISA and virtual machine defined by NVIDIA, used as an intermediate representation for GPU code so tools can compile, inspect, or instrument GPU kernels without targeting specific hardware generations. 4.4, and VxFS.

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    copy

    $ git clone --branch 4.03 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.03

    • Added WARNINGSTATE define support to machine.h and the Customize script, allowing the builder to set the default state for warning message issuance.

    1 detail in Everything

59. 4.02 Mar 21, 1997 · release notes

    lsof 4.02 adds AX.25 support and eases -i protocol lookup requirements

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.02 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.02

    • Added rudimentary AX.25 network layer support for lsof
    • Eased the requirement that service name lookup for the -i option be accompanied by a protocol name when TCPTCPA network protocol that delivers a reliable, ordered stream of bytes between two endpoints. It detects lost data and retransmits it. and UDPUDPA network protocol that sends individual messages without guaranteeing delivery or order. Applications trade built-in reliability for less overhead and can add their own recovery. names yield the same port

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !HP-UX CCIT support disabled in lsof for HP-UX versions 10 and above
60. 4.01 Mar 3, 1997 · release notes

    lsof 4.01 adds TFS support for Pyramid dialects

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch 4.01 https://github.com/lsof-org/lsof.git
    # already have the repo? check out this version:
    $ git checkout 4.01