nl(1) — Linux manual pages

Linux manual pages	Section 1

DESCRIPTION

Write each FILE to standard output, with line numbers added.

With no FILE, or when FILE is −, read standard input.

Mandatory arguments to long options are mandatory for short options too.

−b, −−body−numbering=STYLE/: use STYLE for numbering body lines
−d, −−section−delimiter=CC/: use CC for logical page delimiters
−f, −−footer−numbering=STYLE/: use STYLE for numbering footer lines
−h, −−header−numbering=STYLE/: use STYLE for numbering header lines
−i, −−line−increment=NUMBER/: line number increment at each line
−l, −−join−blank−lines=NUMBER/: group of NUMBER empty lines counted as one
−n, −−number−format=FORMAT/: insert line numbers according to FORMAT
−p, −−no−renumber: do not reset line numbers for each section
−s, −−number−separator=STRING/: add STRING after (possible) line number
−v, −−starting−line−number=NUMBER/: first line number for each section
−w, −−number−width=NUMBER/: use NUMBER columns for line numbers
−−help: display this help and exit
−−version: output version information and exit

Default options are: −bt −d'\:' −fn −hn −i1 −l1 −n'rn' −s<TAB> −v1 −w6

CC are two delimiter characters used to construct logical page delimiters; a missing second character implies ':'. As a GNU extension one can specify more than two characters, and also specifying the empty string (−d '') disables section matching.

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

AUTHOR

Written by Scott Bartram and David MacKenzie.

REPORTING BUGS

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>

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