Linux Commands - Permissions and Special Attributes

Show permissions

To view the permissions of files and directories in a readable format.

ls -lh

Assign 0777 permissions to a file

Allows read, write, and execute for everyone.

chmod 0777 file

Modify permissions of a directory

Assigns read and write permissions to all files within a directory.

chmod -R 0644 directory

Set permissions on a directory

Add or remove read (r), write (w), and execute (x) permissions for the owner (u), group (g), and others (o).

chmod ugo+rwx directory

Change owner of a file

Changes the owner of a specific file.

chown user file

Change owner for all files in a directory

Applies the ownership change to all files in a directory.

chown -R user directory

Change group of a file

Modifies the group of a file.

chgrp group file

Change user and group of a file

Sets both the owner and the group for a file.

chown user:group file

View files with SUID

Shows all system files that have the SUID bit set.

find / -perm -u+s

Set SUID bit on a binary file

Allows the user executing this file to have the same privileges as the owner.

chmod u+s /bin/file

Remove SUID bit from a binary file

Removes the SUID bit from a file.

chmod u-s /bin/file

Set SGID bit on a directory

Assigns the SGID bit to a directory, similar to SUID, but for directories.

chmod g+s /home/directory

Remove SGID bit from a directory

Removes the SGID bit from a directory.

chmod g-s /home/directory

Set STICKY bit on a directory

Allows the deletion of files only by their rightful owners.

chmod o+t /home/directory

Remove STICKY bit from a directory

Removes the STICKY bit from a directory.

chmod o-t /home/directory