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285 lines
6.5 KiB
Groff
285 lines
6.5 KiB
Groff
.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Klaus Klein.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd July 24, 2022
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.Dt NL 1
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.Os
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.Sh NAME
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.Nm nl
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.Nd line numbering filter
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.Sh SYNOPSIS
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.Nm
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.Op Fl p
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.Bk -words
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.Op Fl b Ar type
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.Ek
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.Bk -words
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.Op Fl d Ar delim
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.Ek
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.Bk -words
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.Op Fl f Ar type
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.Ek
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.Bk -words
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.Op Fl h Ar type
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.Ek
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.Bk -words
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.Op Fl i Ar incr
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.Ek
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.Bk -words
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.Op Fl l Ar num
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.Ek
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.Bk -words
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.Op Fl n Ar format
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.Ek
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.Bk -words
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.Op Fl s Ar sep
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.Ek
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.Bk -words
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.Op Fl v Ar startnum
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.Ek
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.Bk -words
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.Op Fl w Ar width
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.Ek
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.Op Ar file
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.Sh DESCRIPTION
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The
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.Nm
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utility reads lines from the named
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.Ar file ,
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applies a configurable line numbering filter operation,
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and writes the result to the standard output.
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If
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.Ar file
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is a single dash
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.Pq Sq Fl
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or absent,
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.Nm
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reads from the standard input.
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.Pp
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The
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.Nm
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utility treats the text it reads in terms of logical pages.
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Unless specified otherwise, line numbering is reset at the start of each
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logical page.
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A logical page consists of a header, a body and a footer
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section; empty sections are valid.
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Different line numbering options are
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independently available for header, body and footer sections.
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.Pp
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The starts of logical page sections are signalled by input lines containing
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nothing but one of the following sequences of delimiter characters:
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.Bl -column "\e:\e:\e:" "Start of" -offset indent
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.Em "Line Start of"
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.It "\e:\e:\e: header"
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.It "\e:\e: body"
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.It "\e: footer"
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.El
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.Pp
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If the input does not contain any logical page section signalling directives,
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the text being read is assumed to consist of a single logical page body.
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.Pp
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The following options are available:
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.Bl -tag -width ".Fl v Ar startnum"
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.It Fl b Ar type
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Specify the logical page body lines to be numbered.
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Recognized
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.Ar type
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arguments are:
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.Bl -tag -width indent
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.It Cm a
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Number all lines.
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.It Cm t
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Number only non-empty lines.
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.It Cm n
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No line numbering.
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.It Cm p Ns Ar expr
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Number only those lines that contain the basic regular expression specified
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by
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.Ar expr .
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.El
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.Pp
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The default
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.Ar type
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for logical page body lines is
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.Cm t .
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.It Fl d Ar delim
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Specify the delimiter characters used to indicate the start of a logical
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page section in the input file.
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At most two characters may be specified;
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if only one character is specified, the first character is replaced and the
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second character remains unchanged.
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The default
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.Ar delim
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characters are
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.Dq Li \e: .
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.It Fl f Ar type
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Specify the same as
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.Fl b Ar type
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except for logical page footer lines.
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The default
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.Ar type
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for logical page footer lines is
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.Cm n .
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.It Fl h Ar type
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Specify the same as
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.Fl b Ar type
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except for logical page header lines.
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The default
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.Ar type
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for logical page header lines is
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.Cm n .
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.It Fl i Ar incr
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Specify the increment value used to number logical page lines.
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The default
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.Ar incr
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value is 1.
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.It Fl l Ar num
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If numbering of all lines is specified for the current logical section
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using the corresponding
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.Fl b Cm a ,
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.Fl f Cm a
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or
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.Fl h Cm a
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option,
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specify the number of adjacent blank lines to be considered as one.
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For example,
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.Fl l
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2 results in only the second adjacent blank line being numbered.
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The default
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.Ar num
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value is 1.
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.It Fl n Ar format
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Specify the line numbering output format.
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Recognized
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.Ar format
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arguments are:
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.Bl -tag -width indent -compact
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.It Cm ln
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Left justified.
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.It Cm rn
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Right justified, leading zeros suppressed.
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.It Cm rz
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Right justified, leading zeros kept.
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.El
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.Pp
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The default
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.Ar format
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is
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.Cm rn .
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.It Fl p
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Specify that line numbering should not be restarted at logical page delimiters.
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.It Fl s Ar sep
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Specify the characters used in separating the line number and the corresponding
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text line.
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The default
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.Ar sep
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setting is a single tab character.
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.It Fl v Ar startnum
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Specify the initial value used to number logical page lines; see also the
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description of the
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.Fl p
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option.
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The default
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.Ar startnum
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value is 1.
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.It Fl w Ar width
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Specify the number of characters to be occupied by the line number;
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in case the
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.Ar width
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is insufficient to hold the line number, it will be truncated to its
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.Ar width
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least significant digits.
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The default
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.Ar width
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is 6.
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.El
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.Sh ENVIRONMENT
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The
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.Ev LANG , LC_ALL , LC_CTYPE
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and
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.Ev LC_COLLATE
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environment variables affect the execution of
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.Nm
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as described in
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.Xr environ 7 .
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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Number all non-blank lines:
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.Bd -literal -offset indent
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$ echo -e "This is\\n\\n\\na simple text" | nl
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1 This is
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2 a simple text
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.Ed
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.Pp
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Number all lines including blank ones, with right justified line numbers with
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leading zeroes, starting at 2, with increment of 2 and a custom multi-character
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separator:
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.Bd -literal -offset indent
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$ echo -e "This\\nis\\nan\\n\\n\\nexample" | nl -ba -n rz -i2 -s "->" -v2
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000002->This
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000004->is
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000006->an
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000008->
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000010->
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000012->example
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.Ed
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.Pp
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Number lines matching regular expression for an
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.Em i
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.No followed by either
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.Em m
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.No or
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.Em n
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.Bd -literal -offset indent
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$ echo -e "This is\\na simple text\\nwith multiple\\nlines" | nl -bp'i[mn]'
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This is
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1 a simple text
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with multiple
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2 lines
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.Ed
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.Sh SEE ALSO
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.Xr jot 1 ,
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.Xr pr 1
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.1-2001 .
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.At III .
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.Sh BUGS
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Input lines are limited to
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.Dv LINE_MAX
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(2048) bytes in length.
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