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UNIX in a Nutshell: System V Edition

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UNIX Commands
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nl [options] [file]

Number the lines of file in logical page segments. Numbering resets to 1 at the start of each page.



Number lines according to type. Values are:

aAll lines.
nNo lines.

Text lines only (the default).


Lines containing exp only.


Use characters xy to delimit logical pages (default is \:).


Like -b but number footer (default type is n).


Like -b but number header (default type is n).


Increment each line number by n (default is 1).


Count n consecutive blank lines as one line.


Set line number format. Values are:


Left justify, omit leading zeros.


Right justify, omit leading zeros (default).


Right justify.


Do not reset numbering at start of pages.


Separate text from line number with character(s) c (default is a tab).


Number each page starting at n (default is 1).


Use n columns to show line number (default is 6).


List the current directory, numbering files as 1), 2), etc.:

ls | nl -w3 -s')  '

Number C source code and save it:

nl prog.c > print_prog

Number only lines that begin with #include:

nl -bp"^#include" prog.c

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