Basic Linux Commands
ls	List directory contents.
ls -l 	long listing with dates and permissions
ls -a 	list all, including hidden files (hidden files start with a period)
cd	Change directory.
cd - 	change to previous directory
cd ~ 	change to home directory
cd .. 	change to parent directory
pwd	Print current (working) directory.
cp	Copy file(s).
cp -r 	somedir somedest Copy recursively (directory and all contents)
mv	Move (or rename) a file (or directory)
rm	Delete (remove) a file.
rm -r 	somedir Delete recursively (directory and all contents)
rm -ri 	somedir Delete recursively, but prompt before each removal
rm -rf 	somedir Delete recursively, never prompt
mkdir	Create directory.
rmdir	Remove (empty) directory.
cat	Print file contents (to console).
less	Scroll through file contents, one page at a time. SPACEBAR to advance a page, B to go back a page, Q to quit, /pattern to search for pattern
exit	Close shell. If this is your login shell, you will log out.