For files, sets the save-text attribute. The chmod command also permits you to use octal notation for the mode. 2000 Sets group ID on execution. Sets the link permission to directories or sets the save-text attribute for files. 0400 Permits read by owner.
Permits write by owner.
Permits execute or search by owner. Permits read by group. Permits write by group. Permits execute or search by group. Permits read by others.