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.TH CHOWN 1 "Feb 21, 2019"
.SH NAME
chown \- change file ownership
.SH SYNOPSIS
.LP
.nf
\fBchown\fR [\fB-fhR\fR] \fIowner\fR[:\fIgroup\fR] \fIfile\fR...
.fi

.LP
.nf
\fBchown\fR \fB-s\fR [\fB-fhR\fR] \fIownersid\fR[:\fIgroupsid\fR] \fIfile\fR...
.fi

.LP
.nf
\fBchown\fR \fB-R\fR [\fB-f\fR] [\fB-H\fR | \fB-L\fR | \fB-P\fR] \fIowner\fR[:\fIgroup\fR] \fIfile\fR...
.fi

.LP
.nf
\fBchown\fR \fB-s\fR \fB-R\fR [\fB-f\fR] [\fB-H\fR | \fB-L\fR | \fB-P\fR] \fIownersid\fR[:\fIgroupsid\fR] \fIfile\fR...
.fi

.SH DESCRIPTION
.LP
The \fBchown\fR utility sets the user \fBID\fR of the file named by each
\fBfile\fR to the user \fBID\fR specified by \fIowner\fR, and, optionally, sets
the group \fBID\fR to that specified by \fIgroup\fR.
.sp
.LP
If \fBchown\fR is invoked by other than the super-user, the set-user-\fBID\fR
bit is cleared.
.sp
.LP
Only the owner of a file (or the super-user) can change the owner of that file.
.sp
.LP
The operating system has a configuration option
\fB{_POSIX_CHOWN_RESTRICTED}\fR, to restrict ownership changes. When this
option is in effect the owner of the file is prevented from changing the owner
\fBID\fR of the file. Only the super-user can arbitrarily change owner
\fBID\fRs whether or not this option is in effect. To set this configuration
option, include the following line in \fB/etc/system\fR:
.sp
.in +2
.nf
\fBset rstchown = 1\fR
.fi
.in -2
.sp

.sp
.LP
To disable this option, include the following line in \fB/etc/system\fR:
.sp
.in +2
.nf
\fBset rstchown = 0\fR
.fi
.in -2
.sp

.sp
.LP
\fB{_POSIX_CHOWN_RESTRICTED}\fR is enabled by default. See \fBsystem\fR(5) and
\fBfpathconf\fR(2).
.SH OPTIONS
.LP
The following options are supported:
.sp
.ne 2
.na
\fB\fB-f\fR\fR
.ad
.RS 6n
Force. Does not report errors.
.RE

.sp
.ne 2
.na
\fB\fB-h\fR\fR
.ad
.RS 6n
If the file is a symbolic link, this option changes the owner of the symbolic
link. Without this option, the owner of the file referenced by the symbolic
link is changed.
.RE

.sp
.ne 2
.na
\fB\fB-H\fR\fR
.ad
.RS 6n
If the file specified on the command line is a symbolic link referencing a file
of type directory, this option changes the owner of the directory referenced by
the symbolic link and all the files in the file hierarchy below it. If a
symbolic link is encountered when traversing a file hierarchy, the owner of the
target file is changed, but no recursion takes place.
.RE

.sp
.ne 2
.na
\fB\fB-L\fR\fR
.ad
.RS 6n
If the file is a symbolic link, this option changes the owner of the file
referenced by the symbolic link. If the file specified on the command line, or
encountered during the traversal of the file hierarchy, is a symbolic link
referencing a file of type directory, then this option changes the owner of the
directory referenced by the symbolic link and all files in the file hierarchy
below it.
.RE

.sp
.ne 2
.na
\fB\fB-P\fR\fR
.ad
.RS 6n
If the file specified on the command line or encountered during the traversal
of a file hierarchy is a symbolic link, this option changes the owner of the
symbolic link. This option does not follow the symbolic link to any other part
of the file hierarchy.
.RE

.sp
.ne 2
.na
\fB\fB-R\fR\fR
.ad
.RS 6n
Recursive. \fBchown\fR descends through the directory, and any subdirectories,
setting the specified ownership \fBID\fR as it proceeds. When a symbolic link
is encountered, the owner of the symbolic link is changed, unless the
\fB-H\fR or \fB-L\fR option is specified. Unless the \fB-H\fR, \fB-L\fR, or \fB-P\fR
option is specified, the \fB-P\fR option is used as the default mode.
.RE

.sp
.ne 2
.na
\fB\fB-s\fR\fR
.ad
.RS 6n
The owner and/or group arguments are Windows SID strings. This option requires
a file system that supports storing SIDs, such as ZFS.
.RE

.sp
.LP
Specifying more than one of the mutually-exclusive options \fB-H\fR, \fB-L\fR,
or \fB-P\fR is not considered an error. The last option specified determines
the behavior of \fBchown\fR.

.SH OPERANDS
.LP
The following operands are supported:
.sp
.ne 2
.na
\fB\fIowner\fR[\fB:\fR\fIgroup\fR]\fR
.ad
.RS 17n
A user \fBID\fR and optional group \fBID\fR to be assigned to \fBfile\fR. The
\fIowner\fR portion of this operand must be a user name from the user database
or a numeric user \fBID\fR. Either specifies a user \fBID\fR to be given to
each file named by \fIfile\fR. If a numeric \fIowner\fR exists in the user
database as a user name, the user \fBID\fR number associated with that user
name is used as the user \fBID\fR. Similarly, if the \fIgroup\fR portion of
this operand is present, it must be a group name from the group database or a
numeric group \fBID\fR. Either specifies a group \fBID\fR to be given to each
file. If a numeric group operand exists in the group database as a group name,
the group \fBID\fR number associated with that group name is used as the group
\fBID\fR.
.RE

.sp
.ne 2
.na
\fB\fIfile\fR\fR
.ad
.RS 17n
A path name of a file whose user \fBID\fR is to be modified.
.RE

.SH USAGE
.LP
See \fBlargefile\fR(7) for the description of the behavior of \fBchown\fR when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
.SH EXAMPLES
.LP
\fBExample 1 \fRChanging Ownership of All Files in the Hierarchy
.sp
.LP
The following command changes ownership of all files in the hierarchy,
including symbolic links, but not the targets of the links:

.sp
.in +2
.nf
example% \fBchown \(miR \(mih \fIowner\fR[:group] \fIfile\fR...\fR
.fi
.in -2
.sp

.SH ENVIRONMENT VARIABLES
.LP
See \fBenviron\fR(7) for descriptions of the following environment variables
that affect the execution of \fBchown\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.SH EXIT STATUS
.LP
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 6n
The utility executed successfully and all requested changes were made.
.RE

.sp
.ne 2
.na
\fB\fB>0\fR\fR
.ad
.RS 6n
An error occurred.
.RE

.SH FILES
.ne 2
.na
\fB\fB/etc/passwd\fR\fR
.ad
.RS 15n
System password file
.RE

.SH ATTRIBUTES
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled. See \fBNOTES\fR.
_
Interface Stability	Committed
_
Standard	See \fBstandards\fR(7).
.TE

.SH SEE ALSO
.LP
.BR chgrp (1),
.BR chmod (1),
.BR ksh93 (1),
.BR chown (2),
.BR fpathconf (2),
.BR passwd (5),
.BR system (5),
.BR attributes (7),
.BR environ (7),
.BR largefile (7),
.BR standards (7)
.SH NOTES
.LP
\fBchown\fR is \fBCSI\fR-enabled except for the \fIowner\fR and \fIgroup\fR
names.
.sp
.LP
In the past the behavior of \fB/usr/xpg4/bin/chown\fR and
\fB/usr/bin/chown\fR utilities was different. Now they behave the same way.