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 see the permissions:

400 read by owner 040 read by group 004 read by anybody (other) 200 written by owner 020 write by group 002 written by anyone 100 execute by owner 010 execute by group 001 execute by anybody

To obtain a combination, just add them.
For example, to be read, written, executed by the owner,
read, executed, by group and executed by anyone
you would add 400+200+100+040+010+001 to give 751.