| mv a b | renames/moves a to b |
| rm [a-l]* | removes files starting with a-l |
| rm -rf directory_or_filename | remove anything, including directories, without prompting |
| ln -s {directory_or_filename} linkname | creates symbolic link linkname to a file or directory |
| chmod go-r foo | makes foo unreadable to anyone else |
| chmod guo+x foo | makes foo executable for everyone |
| scp -r [user@]machine1:dir1/file1 [user@]machine2:dir2/file2 | securely copy files between machines |
| rsync [user@]machine1:dir1/file1 [user@]machine2:dir2/file2 | does remote (securely if using ssh) copying efficiently by only copying file differences |