# nl
```
nl [OPTION]... [FILE]...
```
Number lines of files
## After Help
`STYLE` is one of:
* `a` number all lines
* `t` number only nonempty lines
* `n` number no lines
* `pBRE` number only lines that contain a match for the basic regular
expression, `BRE`
`FORMAT` is one of:
* `ln` left justified, no leading zeros
* `rn` right justified, no leading zeros
* `rz` right justified, leading zeros