1. Computing
Linux / Unix Command: nl
Command Library

NAME

nl - number lines of files  

SYNOPSIS

nl [OPTION]... [FILE]...  

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 separating logical pages
-f, --footer-numbering=STYLE
use STYLE for numbering footer lines
-h, --header-numbering=STYLE
use STYLE for numbering header lines
-i, --page-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 at logical pages
-s, --number-separator=STRING
add STRING after (possible) line number
-v, --first-page=NUMBER
first line number on each logical page
-w, --number-width=NUMBER
use NUMBER columns for line numbers
--help
display this help and exit
--version
output version information and exit

By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn. CC are two delimiter characters for separating logical pages, a missing second character implies :. Type \\ for \. STYLE is one of:

a
number all lines
t
number only nonempty lines
n
number no lines
pREGEXP
number only lines that contain a match for REGEXP

FORMAT is one of:

ln
left justified, no leading zeros
rn
right justified, no leading zeros
rz
right justified, leading zeros
 

SEE ALSO

The full documentation for nl is maintained as a Texinfo manual. If the info and nl programs are properly installed at your site, the command
info nl

should give you access to the complete manual.


Important: Use the man command (% man) to see how a command is used on your particular computer.

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