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-.\" Copyright (c) 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the Institute of Electrical and Electronics Engineers, Inc.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)sort.1	8.2 (Berkeley) 5/4/95
-.\"
-.Dd May 4, 1995
-.Dt SORT 1
-.Os
-.Sh NAME
-.Nm sort
-.Nd sort or merge text files
-.Sh SYNOPSIS
-.Nm sort
-.Op Fl mubdfinrtx
-.Oo
-.Cm \(pl Ns Ar pos1
-.Op Fl Ns Ar pos2
-.Oc
-.Ar ...
-.Op Fl o Ar output
-.Op Fl T Ar directory
-.Op Ar file
-.Ar ...
-.Sh DESCRIPTION
-The
-.Nm sort
-utility
-sorts text files by lines.
-Comparisons are based on one or more sort keys (or fields) extracted
-from each line of input, and are performed
-lexicographically. By default, if keys are not given,
-.Nm sort
-regards each input line as a single field.
-.Pp
-The following options are available:
-.Bl -tag -width indent
-.It Fl c
-Check that the single input file is sorted lexicographically.
-If the file is not sorted,
-.Nm sort
-sorts it and writes the sorted output to the standard output or the
-filename specified by the
-.Fl o
-option.
-.It Fl m
-Merge only; the input files are assumed to be pre-sorted.
-.It Fl o Ar output
-The argument given is the name of an
-.Ar output
-file to
-be used instead of the standard output.
-This file
-can be the same as one of the input files.
-.It Fl T Ar directory
-The argument
-.Ar directory
-is used for creating temporary files.
-.It Fl u
-Unique: suppress all but one in each set of lines
-having equal keys.
-If used with the
-.Fl c
-option,
-check that there are no lines with duplicate keys.
-.El
-.Pp
-The following options override the default ordering rules.
-When ordering options appear independent of key field
-specifications, the requested field ordering rules are
-applied globally to all sort keys.
-.\" When attached to a
-.\" specific key
-.\" (see
-.\" .Fl k ) ,
-.\" the specified ordering options override
-.\" all global ordering options for that key.
-.Bl -tag -width indent
-.It Fl d
-Only blank space and alphanumeric characters
-.\" according
-.\" to the current setting of LC_CTYPE
-are used
-in making comparisons.
-.It Fl f
-Considers all lowercase characters that have uppercase
-equivalents to be the same for purposes of
-comparison.
-.It Fl i
-Ignore all non-printable characters.
-.It Fl n
-An initial numeric string, consisting of optional
-blank space, optional minus sign, and zero or more
-digits (including decimal point)
-.\" with
-.\" optional radix character and thousands
-.\" separator
-.\" (as defined in the current locale),
-is sorted by arithmetic value.
-The
-.Fl n
-option implies
-the
-.Fl b
-option. (See below.)
-Note that the
-.Fl b
-option
-is only effective when key fields have been specified
-and that
-.Fl \&0
-is considered equal to zero.
-.It Fl r
-Reverse the sense of comparisons.
-.El
-.Pp
-The treatment of field separators can be altered using the
-options:
-.Bl -tag -width indent
-.It Fl b
-Leading blank spaces are ignored when determining the starting
-ending positions of a restricted sort key.
-If the
-.Fl b
-option is specified before the first
-.Cm \(pl Ns Ar pos1
-argument, it shall be applied to all
-.Cm \(pl Ns Ar pos1
-arguments.
-Otherwise, the
-.Fl b
-option can be
-attached independently to each
-.Cm \(pl Ns Ar pos1
-or
-.Fl Ar pos2
-argument (see below).
-.It Fl t Ar char
-.Ar Char
-is used as the field separator character;
-.Ar char
-is not considered to be part of a field (although it
-can be included in a sort key).
-Each occurrence of
-.Ar char
-is significant (for example,
-.Dq Ar charchar
-delimits an empty field).
-If
-.Fl t
-is not specified,
-blank space characters are used as default field
-separators.
-.It Cm \(pl Ns Ar pos1
-Designates the start position of a key field.
-.It Fl Ns Ar pos1
-Designates the end position of a key field.
-.El
-.Pp
-The following operands are available:
-.Bl -tag -width indent
-.Ar file
-The pathname of a file to be sorted, merged, or checked.
-If no file
-operands are specified, or if
-a file operand is
-.Fl ,
-the standard input is used.
-.Pp
-A field is
-defined as a minimal sequence of characters followed by a
-field separator or a newline character.
-By default, the first
-blank space of a sequence of blank spaces acts as the field separator.
-All blank spaces in a sequence of blank spaces are considered
-to be part of the next field; for example, all blank spaces at
-the beginning of a line are considered to be part of the
-first field.
-.Pp
-Fields are specified
-by the
-.Cm \(pl Ns Ar pos1
-and
-.Fl Ar pos2
-arguments.  A missing
-.Cm \(pl Ns Ar pos1
-argument defaults to the beginning of a line.
-A missing
-.Fl Ar pos2
-argument defaults to the end of a line.
-.Pp
-The arguments
-.Cm \(pl Ns Ar pos1
-and
-.Fl Ar pos2
-have the form
-.Em m.n
-followed by one or more of the options
-.Fl b , d , f , i ,
-.Fl n , r .
-A
-.Cm \(pl Ns Ar pos1
-position specified by
-.Em m.n
-is interpreted to
-mean the
-.Em n Ns th
-character in the
-.Em m Ns \(pl1th
-field.
-A missing
-.Em \&.n
-means
-.Ql \&.0 ,
-indicating the first character of the
-.Em m Ns \(pl1th
-field.
-If the
-.Fl b
-option is in effect,
-.Em n
-is counted from the first
-non-blank character in the
-.Em m Ns \(pl1th
-field;
-.Em m Ns \&.0b
-refers to the first
-non-blank character in the
-.Em m Ns \(pl1th
-field.
-.Pp
-A
-.Fl Ar pos2
-position specified by
-.Em m.n
-is interpreted to mean
-the
-.Em n Ns th
-character (including separators) after the last
-character of the
-.Em m Ns th
-field.
-A missing
-.Em \&.n
-means
-.Ql \&.0 ,
-indicating
-the last character of the
-.Em m Ns th
-field.
-If the
-.Fl b
-option
-is in effect,
-.Em n
-is counted from the last leading blank character in
-the
-.Em m Ns \(pl1th
-field;
-.Em m Ns \&.1b
-refers to the first non-blank character in the
-.Em m Ns \(pl1th
-field.
-.Sh FILES
-.Bl -tag -width Pa -compact
-.It Pa /var/tmp/stm*, /tmp/*
-Default temporary directories (in order of search).
-.El
-.Sh SEE ALSO
-.Xr comm 1 ,
-.Xr uniq 1 ,
-.Xr join 1
-.Sh DIAGNOSTICS
-.Sh BUGS
-Lines which are longer than 4096 are discarded and processing continues.
-.Sh HISTORY
-A
-.Nm
-command appeared in
-.At v6 .