CHMOD

CHMOD is used to change permissions of a file.

PERMISSION COMMAND

U G W

rwx rwx rwx chmod 777 filename

rwx rwx r-x chmod 775 filename

rwx r-x r-x chmod 755 filename

rw- rw- r-- chmod 664 filename

rw- r-- r-- chmod 644 filename

U = User

G = Group

W = World

r = Readable

w = writable

x = executable

- = no permission

Here is another way of looking at it:

Permissions:

400 read by owner

040 read by group

004 read by anybody (other)

200 write by owner

020 write by group

002 write by anybody

100 execute by owner

010 execute by group

001 execute by anybody

To get a combination, just add them up. For example, to get read, write, execute by owner, read, execute, by group, and execute by anybody, you would add 400+200+100+040+010+001 to give 751.