Permits on Files

# chgrp group1 file1

change group of files [man]

# chmod ugo+rwx directory1

set permissions reading (r), write (w) and (x) access to users owner (u) group (g) and others (o) [man]

# chmod go-rwx directory1

remove permits reading (r), write (w) and (x) access to users group (g) and others (or [man]

# chmod u+s /bin/file1

set SUID bit on a binary file - the user that running that file gets same privileges as owner [man]

# chmod u-s /bin/file1

disable SUID bit on a binary file [man]

# chmod g+s /home/public

set SGID bit on a directory - similar to SUID but for directory [man]

# chmod g-s /home/public

disable SGID bit on a directory [man]

# chmod o+t /home/public

set STIKY bit on a directory - allows files deletion only to legitimate owners [man]

# chmod o-t /home/public

disable STIKY bit on a directory [man]

# chown user1 file1

change owner of a file [man]

# chown -R user1 directory1

change user owner of a directory and all the files and directories contained inside [man]

# chown user1:group1 file1

change user and group ownership of a file [man]

# find / -perm -u+s

view all files on the system with SUID configured [man]

# ls -lh

show permits on files [man]

# ls /tmp | pr -T5 -W$COLUMNS

divide terminal into 5 columns [man]