Change the group ownership for a file or directory.
chgrp [OPTION]... GROUP FILE
chgrp [OPTION]... --reference=RFILE FILE
Changes the group ownership of FILE to GROUP. With -reference changes the group ownership of FILE to be the same as RFILE.
There are many options, see the manpage for chgrp(1).
- chgrp www-data file1
Gives group ownership of file1 to the www-data group.
- chgrp -R users dir1
Recurses through the directory and all subdirectories changing group ownership for all files and directories to the users group. Be careful with the -R switch, it can be a big pain to undo mistakes with it!