1)! $: Repeat the last command last parameters.
For example: You use a directory with the command mkdir peter / pan / documents / tinkerbell, now you enter the directory with the command 'CD', you can use CD! $, Shell will add the previous command 'mkdir' parameters to Now 'cd' behind.
2) ~: The home directory.
3) Command Replacement: Command1 $ (Command2)
EG: LOCATE README.MOUSE "The output" = /usr/x11r6/lib/x11/doc/readme.mouse "as the parameters of 'Less', then display the contents of the file .