168 lines
4.8 KiB
Groff
168 lines
4.8 KiB
Groff
.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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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 University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)cut.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd June 6, 1993
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.Dt CUT 1
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.Os
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.Sh NAME
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.Nm cut
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.Nd select portions of each line of a file
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.Sh SYNOPSIS
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.Nm
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.Fl b Ar list
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.Op Fl n
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.Op Ar
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.Nm
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.Fl c Ar list
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.Op Ar
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.Nm
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.Fl f Ar list
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.Op Fl d Ar delim
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.Op Fl s
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility selects portions of each line (as specified by
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.Ar list )
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from each
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.Ar file
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and writes them to the standard output.
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If no
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.Ar file
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arguments are specified, or a file argument is a single dash
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.Pq Sq Fl ,
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.Nm
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reads from from the standard input.
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The items specified by
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.Ar list
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can be in terms of column position or in terms of fields delimited
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by a special character.
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Column numbering starts from 1.
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.Pp
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The
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.Ar list
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option argument
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is a comma or whitespace separated set of increasing numbers and/or
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number ranges.
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Number ranges consist of a number, a dash
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.Pq Sq \- ,
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and a second number
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and select the fields or columns from the first number to the second,
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inclusive.
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Numbers or number ranges may be preceded by a dash, which selects all
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fields or columns from 1 to the first number.
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Numbers or number ranges may be followed by a dash, which selects all
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fields or columns from the last number to the end of the line.
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Numbers and number ranges may be repeated, overlapping, and in any order.
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It is not an error to select fields or columns not present in the
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input line.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl b Ar list
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The
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.Ar list
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specifies byte positions.
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.It Fl c Ar list
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The
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.Ar list
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specifies character positions.
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.It Fl d Ar delim
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Use the first character of
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.Ar delim
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as the field delimiter character instead of the tab character.
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.It Fl f Ar list
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The
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.Ar list
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specifies fields, delimited in the input by a single tab character.
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Output fields are separated by a single tab character.
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.It Fl n
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Do not split multi-byte characters.
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.It Fl s
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Suppress lines with no field delimiter characters.
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Unless specified, lines with no delimiters are passed through unmodified.
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.El
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.Sh ENVIRONMENT
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The
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.Ev LANG ,
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.Ev LC_ALL
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and
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.Ev LC_CTYPE
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environment variables affect the execution of
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.Nm
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if the
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.Fl n
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option is specified.
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Their effect is described in
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.Xr environ 7 .
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.Sh EXAMPLES
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Extract users' login names and shells from the system
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.Xr passwd 5
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file as
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.Dq name:shell
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pairs:
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.Pp
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.Dl "cut -d : -f 1,7 /etc/passwd"
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.Pp
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Show the names and login times of the currently logged in users:
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.Pp
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.Dl "who | cut -c 1-16,26-38"
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.Sh DIAGNOSTICS
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.Ex -std
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.Sh SEE ALSO
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.Xr paste 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 -p1003.2-92 .
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.Sh BUGS
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The
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.Fl c
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option is a synonym for the
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.Fl b
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option, which causes incorrect behaviour in locales that support
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multibyte characters.
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.Pp
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When operating on fields
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.Pq Fl f No option is specified ,
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.Nm
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does not recognise multibyte characters, and the
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.Ar delim
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character is recognised in the middle of multibyte sequences.
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