chgrp – change file group ownership
# which /usr/bin/chgrp
/usr/bin/chgrp
### SETUID / SETGID ### – Sets the effective user/group ID ###
chmod 644 filename
chmod 0644 filename
SETUID – 4
SETGID – 2
chmod 4660 filename.txt
-rwSrw—- filename.txt ( note the S )
### Security Breach Warning ### SETUID run as the owner of the file
Note: SETGID applied to directories, forces assignment of GID
chmod 4644 filename
chmod 2644 filename
Collaborative
SETUID/SETGID
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