lslocks Man page

LSLOCKS(8) System Administration LSLOCKS(8)


lslocks – list local system locks


lslocks [options]


lslocks lists information about all the currently held file locks in a
Linux system.


-J, –json
Use JSON output format.

-n, –noheadings
Do not print a header line.

-o, –output list
Specify which output columns to print. Use –help to get a list
of all supported columns.

The default list of columns may be extended if list is specified
in the format +list (e.g. lslocks -o +BLOCKER).

-p, –pid pid
Display only the locks held by the process with this pid.

-r, –raw
Use the raw output format.

-u, –notruncate
Do not truncate text in columns.

-V, –version
Display version information and exit.

-h, –help
Display help text and exit.

The command name of the process holding the lock.

PID The process ID of the process which holds the lock.

TYPE The type of lock; can be FLOCK (created with flock) or POSIX
(created with fcntl(2) and lockf(3)).

SIZE Size of the locked file.

MODE The lock’s access permissions (read, write). If the process is
blocked and waiting for the lock, then the mode is postfixed
with an ‘*’ (asterisk).

M Whether the lock is mandatory; 0 means no (meaning the lock is
only advisory), 1 means yes. (See fcntl(2).)

START Relative byte offset of the lock.

END Ending offset of the lock.

PATH Full path of the lock. If none is found, or there are no per‐
missions to read the path, it will fall back to the device’s
mountpoint. The path might be truncated; use –notruncate to
get the full path.

The PID of the process which blocks the lock.

The lslocks command is meant to replace the lslk(8) command,
originally written by Victor A. Abell and unmaintained
since 2001.

Davidlohr Bueso


flock, fcntl(2), lockf(2)

The lslocks command is part of the util-linux package and is available

util-linux December 2014 LSLOCKS(8)

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