## 2.2 `!` command

### 2.2.1 Syntax

`!` command

### 2.2.2 Purpose

Run a program, or escape to a shell.

### 2.2.3 Comments

Any command typed here will be passed to the system for it to execute.
The bare command `!` will spawn an interactive shell. Exiting the shell will return.

### 2.2.4 Examples

`! ls *.ckt`
  Run the command `ls *.ckt` as if it were a shell command.
`!`
  No arguments mean to spawn an interactive shell.