Linux Tutorial | Permission Management Commands

1. Change File or Directory Permissions

chmod  # change the permissions mode of a file
chmod [{ugo}{+-=}{rwx}][file or directory]  # u: file owner, g: group, o: others, +: add permission, -: remove permission, =: set permission exclusively      [mode=421][file or directory]          # 4=r, 2=w, 1=x; represent read, write, execute permissions for owner, group, and others respectively, 7 represents full permissions      chmod g+w file1  # grant write permission to group for file file1
chmod 777 dir1  # set directory dir1 to have all permissions for all users

Summary of File and Directory Permissions2. Change File or Directory Owner

chown  # change file ownership
chown [user][file or directory]
chown nobody file1  # change the owner of file file1 to nobody

3. Change File or Directory Group Ownership

chgrp  # change file group ownership
chgrp [group][file or directory]
chgrp adm file1  # change the group of file file1 to adm

4. Display and Set Default File Permissions

umask
umask [-S]  # -S displays the default permissions for newly created files or directories in rwx format

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