xref: /freebsd/usr.sbin/chown/chown.8 (revision 8a7b61203704d362cfbc66c00619f51b24106b55)

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.Dd August 24, 2022
.Dt CHOWN 8
.Os
.Sh NAME
.Nm chown
.Nd change file owner and group
.Sh SYNOPSIS
.Nm
.Op Fl fhvx
.Oo
.Fl R
.Op Fl H | Fl L | Fl P
.Oc
.Ar owner Ns Op : Ns Ar group
.Ar
.Nm
.Op Fl fhvx
.Oo
.Fl R
.Op Fl H | Fl L | Fl P
.Oc
.No : Ns Ar group
.Ar
.Sh DESCRIPTION
The
.Nm
utility changes the user ID and/or the group ID of the specified files.
Symbolic links named by arguments are silently left unchanged unless
.Fl h
is used.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl H
If the
.Fl R
option is specified, symbolic links on the command line are followed
and hence unaffected by the command.
(Symbolic links encountered during traversal are not followed.)
.It Fl L
If the
.Fl R
option is specified, all symbolic links are followed.
.It Fl P
If the
.Fl R
option is specified, no symbolic links are followed.
This is the default.
.It Fl R
Change the user ID and/or the group ID of the file hierarchies rooted
in the files, instead of just the files themselves.
Beware of unintentionally matching the
.Dq Pa ".."
hard link to the parent directory when using wildcards like
.Dq Li ".*" .
.It Fl f
Do not report any failure to change file owner or group, nor modify
the exit status to reflect such failures.
.It Fl h
If the file is a symbolic link, change the user ID and/or the
group ID of the link itself.
.It Fl v
Cause
.Nm
to be verbose, showing files as the owner is modified.
If the
.Fl v
flag is specified more than once,
.Nm
will print the filename, followed by the old and new numeric user/group ID.
.It Fl x
File system mount points are not traversed.
.El
.Pp
The
.Fl H ,
.Fl L
and
.Fl P
options are ignored unless the
.Fl R
option is specified.
In addition, these options override each other and the
command's actions are determined by the last one specified.
.Pp
The
.Ar owner
and
.Ar group
operands are both optional, however, one must be specified.
If the
.Ar group
operand is specified, it must be preceded by a colon (``:'') character.
.Pp
The
.Ar owner
may be either a numeric user ID or a user name.
If a user name is also a numeric user ID, the operand is used as a
user name.
The
.Ar group
may be either a numeric group ID or a group name.
If a group name is also a numeric group ID, the operand is used as a
group name.
.Pp
The ownership of a file may only be altered by a super-user for
obvious security reasons.
.Pp
If
.Nm
receives a
.Dv SIGINFO
signal (see the
.Cm status
argument for
.Xr stty 1 ) ,
then the current filename as well as the old and new file owner and group
are displayed.
.Sh EXIT STATUS
.Ex -std
.Sh COMPATIBILITY
Previous versions of the
.Nm
utility used the dot (``.'') character to distinguish the group name.
This has been changed to be a colon (``:'') character so that user and
group names may contain the dot character.
.Pp
On previous versions of this system, symbolic links did not have
owners.
.Pp
The
.Fl v
and
.Fl x
options are non-standard and their use in scripts is not recommended.
.Sh SEE ALSO
.Xr chgrp 1 ,
.Xr chmod 1 ,
.Xr find 1 ,
.Xr chown 2 ,
.Xr fts 3 ,
.Xr symlink 7
.Sh STANDARDS
The
.Nm
utility is expected to be
.St -p1003.2
compliant.
.Sh HISTORY
A
.Nm
utility appeared in
.At v1 .