245 lines
6.2 KiB
Groff
245 lines
6.2 KiB
Groff
.\" $NetBSD: nl.1,v 1.8 2003/02/25 10:35:50 wiz Exp $
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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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 February 15, 1999
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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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or the standard input if the
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.Ar file
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argument is omitted,
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applies a configurable line numbering filter operation and writes the result
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to the standard output.
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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 section; empty
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sections are valid.
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Different line numbering options are independently available for header,
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body and footer sections.
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.Pp
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The starts of logical page sections are signaled by input lines containing
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nothing but one of the following sequences of delimiter characters:
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.Pp
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.Bd -unfilled -offset indent
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.Bl -column "\e:\e:\e: " "header "
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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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.Ed
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.Pp
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If the input does not contain any logical page section signaling 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 indent
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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 pstringXX
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.It a
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Number all lines.
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.It t
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Number only non-empty lines.
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.It n
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No line numbering.
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.It 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 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; if only one character is specified,
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the first character is replaced and the second character remains unchanged.
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The default
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.Ar delim
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characters are ``\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 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 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
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a,
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.Fl f
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a
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or
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.Fl h
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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 lnXX -compact
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.It ln
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Left justified.
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.It rn
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Right justified, leading zeros suppressed.
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.It 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 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 EXIT STATUS
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The
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.Nm
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utility exits 0 on success, and \*[Gt]0 if an error occurs.
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.Sh SEE ALSO
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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 -xpg4.2
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with the exception of not supporting the intermingling of the
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.Ar file
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operand with the options, which the standard considers an obsolescent feature
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to be removed from a further issue.
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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 V.2 .
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