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tldr/pages/common/$.md

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# $
> Expand a Bash variable.
> More information: <https://gnu.org/software/bash/manual/bash.html#Shell-Variables>.
- Print a variable:
`echo ${{VARIABLE}}`
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- Run variable contents as a command:
`${{VARIABLE}}`
- Print the exit status of the previous command:
`echo $?`
- Print a random number between 0 and 32767:
`echo $RANDOM`
- Print one of the prompt strings:
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`echo ${{PS0|PS1|PS2|PS3|PS4}}`
- Expand with the output of `command` and run it. Same as enclosing `command` in backtics:
`$({{command}})`
- List how many arguments the current context has:
`echo $#`
- Print out a Bash array:
`echo ${array[@]}`