nl

alllinux

Number lines from a file or from `stdin`.

Examples (8)

Number non-blank lines in a file

nl path/to/file

Read from `stdin`

command | nl -

Number [a]ll [b]ody lines including blank lines or do [n]ot number [b]ody lines

nl -b a|n path/to/file

Number only the [b]ody lines that match a basic `regex` (BRE) [p]attern

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

Use a specific [i]ncrement for line numbering

nl -i increment path/to/file

Specify the line numbering format to [r]ight or [l]eft justified, keeping leading [z]eros or [n]ot

nl -n rz|ln|rn

Specify the line numbering's [w]idth (6 by default)

nl -w col_width path/to/file

Use a specific string to [s]eparate the line numbers from the lines (`TAB` by default)

nl -s separator path/to/file