.TH LFS-PROJECT 1 2026-03-19 "Lustre" "Lustre User Utilities"
.SH NAME
lfs-project \- Change or list project attribute for specified file or directory.
.SH SYNOPSIS
.SY "lfs project"
.RB [ -p | --proj-inherit | --inherit
.IR ID ]
.RB [ -d | --directory ]
.RB [ -r | --recursive ]
.RB [ -s | --set-inherit ]
.IR FILE | DIRECTORY ...
.SY "lfs project"
.BR -c | --check
.RB [ -0 | --print0 ]]
.RB [ -d | --directory ]
.RB [ -p | --proj-inherit | --inherit
.IR ID ]
.RB [ -r | --recursive ]
.IR FILE | DIRECTORY ...
.SY "lfs project"
.BR -C | --clear
.RB [ -d | --directory ]
.RB [ -k | --keep ]
.RB [ -r | --recursive ]
.IR FILE | DIRECTORY ...
.YS
.SH DESCRIPTION
.B lfs project
can list or change the numeric project ID and flags stored on individual
.IR FILE "(s) or " DIRECTORIES .
Only one numeric project ID can be stored on each file,
similar to the numeric User ID (UID) or Group ID (GID),
but the ProjID does not affect Unix file access permissions as they do.
The Project ID interface is compatible with existing tools like
.BR chattr (1)
and
.BR lsattr (1)
from
.BR e2fsprogs .
.SH OPTIONS
.TP
.BR -0 ", " --print0
Print pathnames returned by -c with a trailing NUL, suitable for use by
.B 'xargs -0 lfs project -p'.
.TP
.BR -c ", " --check
Check project ID and inherit flag on specified
.IR FILE "(s) or " DIRECTORY .
If
.BR -p | --proj-inherit | --inherit
is not given, then use the project ID on the top-level directory,
otherwise use the specified
.IR ID .
If checking a directory and/or recursively, print only files that do not match
.IR ID .
.TP
.BR -C ", " --clear
Clear inherit attribute and reset project
.I ID
to 0 for
.IR FILE " or " DIRECTORY .
If the
.BR -d | --directory
option is set, then clear only the directory itself.
.TP
.BR -d ", " --directory
Show the directory's own project ID and flags, override
.BR -r | --recursive
option.
.TP
.BR -k ", " --keep
Keep the project ID unchanged.
Can only be specified with
.BR -C | --clear .
.TP
.BR -p ", " --proj-inherit | --inherit
Set project ID and inherit flag on the
.IR FILE "(s) or " DIRECTORIES.
Set project ID with given value for the specified
.IR FILE " or " DIRECTORY .
.TP
.BR -r ", " --recursive
Recursively apply lfs project on all descendants of the
.IR DIRECTORY .
.TP
.BR -p ", " --proj-inherit \fI" ID"
Set project
.I ID
with given value for the specified file or directory.
The project ID is a 32-bit integer (excluding 4294967295) or a project
name as listed in the
.BR /etc/projid (5)
file.
A username or group name can be used in place of a project name by specifying
.BI u: USERNAME
or
.BI user: USERNAME
or
.BI g: GROUPNAME
or
.BI group: GROUPNAME
respectively, though this name will not be shown in place of the numeric ID.
.TP
.BR -s ", " --set-inherit
Set the
.B PROJID_INHERIT
attribute on directories, so that new files and subdirectories created
therein will inherit the project ID and attribute from the parent.
.SH EXAMPLES
set directory quota on
.BR /mnt/lustre/dir1,
all descendants' project ID and inherit attribute are set:
.EX
.RS
.B $ lfs project -srp 1000 /mnt/lustre/dir1
.RE
.EE
.PP
Check directory
.BR /mnt/lustre/dir1,
whether all files and directories ID are 1000, inherit attribute
is properly set for all directories, print mismatch
if any are found:
.EX
.RS
.B $ lfs project -cr -p 1000 /mnt/lustre/dir1
.RE
.EE
.SH AVAILABILITY
.B lfs project
is part of the
.BR lustre (7)
filesystem package since release 2.11.0.
.\" Added in commit v2_10_56_0-77-g022c5a9a77
.SH SEE ALSO
.BR chattr (1),
.BR lfs (1),
.BR lfs-quota (1),
.BR lsattr (1),
.BR xargs (1),
.BR mdt.enable_chprojid_gid (4),
.BR projid (5)