Isilon: How to change a file owner

IMPORTANT: The ownership of a file may only be altered by a super-user for security reasons.

Synopsis:

chown [OPTIONS] USER[:GROUP] FILE(s)

USER is the user name or the user ID (UID) of the new owner. GROUP is the name of the new group or the group ID (GID). FILE(s) is the name of one or more files, directories or links. Numeric IDs should be prefixed with the + symbol.

• USER - If only the user is specified, the specified user will become the owner of the given files, the group ownership is not changed.
• USER: - When the username is followed by a colon :, and the group name is not given, the user will become the owner of the files, and the files group ownership is changed to user’s login group.
• USER:GROUP - If both the user and the group are specified (with no space betwen them), the user ownership of the files is changed to the given user and the group ownership is changed to the given group.
• :GROUP - If the User is omitted and the group is prefixed with a colon :, only the group ownership of the files is changed to the given group.
• : If only a colon : is given, without specifying the user and the group, no change is made.

By default, on success, chown doesn’t produce any output and returns zero.

How to Change the Owner of a File

To change the owner of a file use the chown command followed by the user name of the new owner and the target file as an argument:

# chown USER FILE

To change the ownership of multiple files or directories, specify them as a space-separated list. The command below changes the ownership of a file named file1 and directory dir1 to a new owner named test:

# chown test file1 dir1

 

How to Change the Group of a File

To change only the group of a file use the chown command followed by a colon (:) and the new group name (with no space between them) and the target file as an argument:

# chown :GROUP FILE

How to Change the Owner and Group of a File

To change both the owner and the group of a file use the chown command followed by the new owner and group separated by a colon (:) with no intervening spaces and the target file.

# chown USER:GROUP FILE

If you omit the group name after the colon (:) the group of the file is changed to the specified user’s login group:
 

Notes
> chgrp command can also be used to change the owner group

> Use the below option to make the changes recursive
-R, --recursive
operate on files and directories recursively

> The numeric user ID (UID) can be used instead of the username

> To check all command's options and additional information type #man chown in your terminal.

Examples

# chown root /u
Change the owner of /u to "root".

# chown root:staff /u
Likewise, but also change its group to "staff".

# chown -hR root /u
Change the owner of /u and subfiles to "root".