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NL(1)			FreeBSD	General	Commands Manual			 NL(1)

NAME
     nl	-- line	numbering filter

SYNOPSIS
     nl	[-p] [-b type] [-d delim] [-f type] [-h	type] [-i incr]	[-l num]
	[-n format] [-s	sep] [-v startnum] [-w width] [file]

DESCRIPTION
     The nl utility reads lines	from the named file or the standard input if
     the file argument is omitted, applies a configurable line numbering fil-
     ter operation and writes the result to the	standard output.

     The nl utility treats the text it reads in	terms of logical pages.
     Unless specified otherwise, line numbering	is reset at the	start of each
     logical page.  A logical page consists of a header, a body	and a footer
     section; empty sections are valid.	 Different line	numbering options are
     independently available for header, body and footer sections.

     The starts	of logical page	sections are signalled by input	lines contain-
     ing nothing but one of the	following sequences of delimiter characters:

	   Line	     Start of
	   \:\:\:    header
	   \:\:	     body
	   \:	     footer

     If	the input does not contain any logical page section signalling direc-
     tives, the	text being read	is assumed to consist of a single logical page
     body.

     The following options are available:

     -b	type	  Specify the logical page body	lines to be numbered.  Recog-
		  nized	type arguments are:

		  a	  Number all lines.

		  t	  Number only non-empty	lines.

		  n	  No line numbering.

		  pexpr	  Number only those lines that contain the basic regu-
			  lar expression specified by expr.

		  The default type for logical page body lines is t.

     -d	delim	  Specify the delimiter	characters used	to indicate the	start
		  of a logical page section in the input file.	At most	two
		  characters may be specified; if only one character is	speci-
		  fied,	the first character is replaced	and the	second charac-
		  ter remains unchanged.  The default delim characters are
		  ``\:''.

     -f	type	  Specify the same as -b type except for logical page footer
		  lines.  The default type for logical page footer lines is n.

     -h	type	  Specify the same as -b type except for logical page header
		  lines.  The default type for logical page header lines is n.

     -i	incr	  Specify the increment	value used to number logical page
		  lines.  The default incr value is 1.

     -l	num	  If numbering of all lines is specified for the current logi-
		  cal section using the	corresponding -b a, -f a or -h a
		  option, specify the number of	adjacent blank lines to	be
		  considered as	one.  For example, -l 2	results	in only	the
		  second adjacent blank	line being numbered.  The default num
		  value	is 1.

     -n	format	  Specify the line numbering output format.  Recognized	format
		  arguments are:
		  ln	  Left justified.
		  rn	  Right	justified, leading zeros suppressed.
		  rz	  Right	justified, leading zeros kept.

		  The default format is	rn.

     -p		  Specify that line numbering should not be restarted at logi-
		  cal page delimiters.

     -s	sep	  Specify the characters used in separating the	line number
		  and the corresponding	text line.  The	default	sep setting is
		  a single tab character.

     -v	startnum  Specify the initial value used to number logical page	lines;
		  see also the description of the -p option.  The default
		  startnum value is 1.

     -w	width	  Specify the number of	characters to be occupied by the line
		  number; in case the width is insufficient to hold the	line
		  number, it will be truncated to its width least significant
		  digits.  The default width is	6.

ENVIRONMENT
     The LANG, LC_ALL, LC_CTYPE	and LC_COLLATE environment variables affect
     the execution of nl as described in environ(7).

EXIT STATUS
     The nl utility exits 0 on success,	and >0 if an error occurs.

SEE ALSO
     jot(1), pr(1)

STANDARDS
     The nl utility conforms to	IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY
     The nl utility first appeared in AT&T System V Release 2 UNIX.

BUGS
     Input lines are limited to	LINE_MAX (2048)	bytes in length.

FreeBSD	10.1		       January 26, 2005			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | EXIT STATUS | SEE ALSO | STANDARDS | HISTORY | BUGS

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