---
title: Shell script - "$"
description: Shell script - "$" usage
cover: ../../../assets/images/memo_dollar_sign.png
---

## `$0`

The name of the script being executed.

## `$1-$9`

The first nine arguments of the script.

## `$#`

The number of arguments passed to the script.

## `$*`

All arguments of the script as a single string.

## `$@`

All arguments of the script as an array.

## `$?`

The exit status of the last executed command.

## `$$`

The process ID of the current shell.

## `$!`

The process ID of the last background command.

## `$-`

Shows the current shell options or flags.