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NetBSD 6.1.5 - man page for nl (netbsd section 1)

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NL(1)				   BSD 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 filter operation and writes the result to the
     standard output.

     The nl utility treats the text it reads in terms of logical pages.  Unless specified other-
     wise, 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 signaled by input lines containing 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 signaling directives, 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.  Recognized 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 regular expression speci-
			fied 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 sec-
	     tion in the input file.  At most two characters may be specified; if only one char-
	     acter is specified, the first character is replaced and the second character 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 logical 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 logical 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 descrip-
	     tion 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.

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

SEE ALSO
     pr(1)

STANDARDS
     The nl utility conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'') with the
     exception of not supporting the intermingling of the file operand with the options, which
     the standard considers an obsolescent feature to be removed from a further issue.

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

BSD					February 15, 1999				      BSD
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