Linux memo

CHMOD is used to change the 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

Another way to look at 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 obtain a combination, simply add them together. For example, to be read, written, and executed by the owner, read and executed by the group, and executed by anyone, you would add 400+200+100+040+010+001 to get 751.