Change owner, change the user and/or group ownership of each given File to a new Owner.
Chown can also change the ownership of a file to match the user/group of an existing reference file.

chown [Options]… NewOwner File…

chown [Options]… :Group File…

chown [Options]… –reference=RFILE File…

If used, NewOwner specifies the new owner and/or group as follows
(with no embedded white space):

[OWNER] [ [:.] [GROUP] ]

Some examples of how the owner/group can be specified:

If only an OWNER (a user name or numeric user id) is given, that
user is made the owner of each given file, and the files&qt;&qt; group is
not changed.

If the OWNER is followed by a colon or dot and a GROUP (a group
name or numeric group id), with no spaces between them, the group
ownership of the files is changed as well (to GROUP).

If a colon or dot but no group name follows OWNER, that user is
made the owner of the files and the group of the files is changed
to OWNER&qt;&qt;s login group.

If the colon or dot and following GROUP are given, but the owner
is omitted, only the group of the files is changed; in this case,
&qt;chown&qt;&qt; performs the same function as &qt;chgrp&qt;&qt;.


Verbosely describe the action for each FILE whose ownership
actually changes.

Do not act on symbolic links themselves but rather on what they
point to.

Do not print error messages about files whose ownership cannot be

Act on symbolic links themselves instead of what they point to.
This is the default. This mode relies on the &qt;lchown&qt;&qt; system call.
On systems that do not provide the &qt;lchown&qt;&qt; system call, &qt;chown&qt;&qt;
fails when a file specified on the command line is a symbolic link.
By default, no diagnostic is issued for symbolic links encountered
during a recursive traversal, but see &qt;–verbose&qt;&qt;.

Use the user and group of the reference FILE instead of an explicit
NewOwner value.

Recursively change ownership of directories and their contents.

Verbosely describe the action (or non-action) taken for every FILE.
If a symbolic link is encountered during a recursive traversal on
a system without the &qt;lchown&qt;&qt; system call, and &qt;–no-dereference&qt;&qt;
is in effect, then issue a diagnostic saying neither the symbolic
link nor its referent is being changed.