UNIX Commands

• cd - change directory
• ls - list contents of directory
• pwd - print the present directory
• man - find information about commands
• touch - update the modification time of a file or create new file if it doesn't exist
• rm - remove a file
• mkdir - make a directory
• rmdir - remove a directory
• who - who is logged in on the system
• file - print the file type of a file
• grep - search for a pattern in a file
• ps - list the running processes
• find - find files, inodes, permissions ....
• cat - look at the contents of a file
• more - look at the contents of a file a screen at a time
• head - look at the begining lines of a file
• tail - look at the last lines of a file
• passwd - change your password
• chmod - change the permissions on a fle
• chgrp - change the group ownership of file

Permission

w - write

x - execute