nl actually first was available with System III, not System Vr2. Updated based on discussion on TUHS mailing list (archive recently moved so this message isn't get available in the archive). Suggested by: segalogo (Matt G)
286 lines
6.6 KiB
Groff
286 lines
6.6 KiB
Groff
.\" $FreeBSD$
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.\"
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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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