Bash

Bash is a Unix shell.

Bash Command Shortcuts

Command	Use	Example
`history`	Show list of previous commands	`history 5` will show last five commands executed
`!123`	Execute command `123` from history	`sudo !123` will execute command 123 from history with `sudo`
`!!`	Execute previous command	`sudo !!` will execute the last command with sudo
`&`	Run command in background	`hugo serve &` will run `hugo serve` in the background

Operator	Use	Example
`;`	Chain commands, despite failure	`mkdir a; mkdir b` will call `mkdir b` whether `mkdir a` succeeds or not
`&&`	Chain commands, if successful	`mkdir a && mkdir b` will call `mkdir b` only if `mkdir a` succeeds
`\|\|`	Chain commands, if failure	`mkdir a \|\| mkdir b` will call `mkdir b` only if `mkdir a` fails
`\|`	Pass command output as input to next command	`ps -ef \| less` will use `less` to scroll through output of `pf -es`