# nl

> A utility for numbering lines, either from a file, or from `stdin`.
> More information: <https://www.gnu.org/software/coreutils/nl>.

- Number non-blank lines in a file:

`nl {{path/to/file}}`

- Read from `stdout`:

`cat {{path/to/file}} | nl {{options}} -`

- Number only the lines with printable text:

`nl -t {{path/to/file}}`

- Number all lines including blank lines:

`nl -b a {{path/to/file}}`

- Number only the body lines that match a basic regular expression (BRE) pattern:

`nl -b p'FooBar[0-9]' {{path/to/file}}`