175 lines
4.8 KiB
Groff
175 lines
4.8 KiB
Groff
.\" Copyright (c) 1989, 1990, 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.
|
|
.\"
|
|
.\" @(#)cut.1 8.1 (Berkeley) 6/6/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 6, 1993
|
|
.Dt CUT 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm cut
|
|
.Nd select portions of each line of a file
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Fl b Ar list
|
|
.Op Fl n
|
|
.Op Ar
|
|
.Nm
|
|
.Fl c Ar list
|
|
.Op Ar
|
|
.Nm
|
|
.Fl f Ar list
|
|
.Op Fl d Ar delim
|
|
.Op Fl s
|
|
.Op Ar
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility selects portions of each line (as specified by
|
|
.Ar list )
|
|
from each
|
|
.Ar file
|
|
and writes them to the standard output.
|
|
If no
|
|
.Ar file
|
|
arguments are specified, or a file argument is a single dash
|
|
.Pq Sq Fl ,
|
|
.Nm
|
|
reads from from the standard input.
|
|
The items specified by
|
|
.Ar list
|
|
can be in terms of column position or in terms of fields delimited
|
|
by a special character.
|
|
Column numbering starts from 1.
|
|
.Pp
|
|
The
|
|
.Ar list
|
|
option argument
|
|
is a comma or whitespace separated set of increasing numbers and/or
|
|
number ranges.
|
|
Number ranges consist of a number, a dash
|
|
.Pq Sq \- ,
|
|
and a second number
|
|
and select the fields or columns from the first number to the second,
|
|
inclusive.
|
|
Numbers or number ranges may be preceded by a dash, which selects all
|
|
fields or columns from 1 to the first number.
|
|
Numbers or number ranges may be followed by a dash, which selects all
|
|
fields or columns from the last number to the end of the line.
|
|
Numbers and number ranges may be repeated, overlapping, and in any order.
|
|
It is not an error to select fields or columns not present in the
|
|
input line.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width indent
|
|
.It Fl b Ar list
|
|
The
|
|
.Ar list
|
|
specifies byte positions.
|
|
.It Fl c Ar list
|
|
The
|
|
.Ar list
|
|
specifies character positions.
|
|
.It Fl d Ar delim
|
|
Use the first character of
|
|
.Ar delim
|
|
as the field delimiter character instead of the tab character.
|
|
.It Fl f Ar list
|
|
The
|
|
.Ar list
|
|
specifies fields, delimited in the input by a single tab character.
|
|
Output fields are separated by a single tab character.
|
|
.It Fl n
|
|
Do not split multi-byte characters.
|
|
.It Fl s
|
|
Suppress lines with no field delimiter characters.
|
|
Unless specified, lines with no delimiters are passed through unmodified.
|
|
.El
|
|
.Sh ENVIRONMENT
|
|
The
|
|
.Ev LANG ,
|
|
.Ev LC_ALL
|
|
and
|
|
.Ev LC_CTYPE
|
|
environment variables affect the execution of
|
|
.Nm
|
|
if the
|
|
.Fl n
|
|
option is specified.
|
|
Their effect is described in
|
|
.Xr environ 7 .
|
|
.Sh EXAMPLES
|
|
Extract users' login names and shells from the system
|
|
.Xr passwd 5
|
|
file as
|
|
.Dq name:shell
|
|
pairs:
|
|
.Pp
|
|
.Dl "cut -d : -f 1,7 /etc/passwd"
|
|
.Pp
|
|
Show the names and login times of the currently logged in users:
|
|
.Pp
|
|
.Dl "who | cut -c 1-16,26-38"
|
|
.Sh DIAGNOSTICS
|
|
.Ex -std
|
|
.Sh SEE ALSO
|
|
.Xr paste 1
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm
|
|
utility conforms to
|
|
.St -p1003.2-92 .
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
command appeared in
|
|
.Tn AT&T
|
|
System III
|
|
.Ux .
|
|
.Sh BUGS
|
|
The
|
|
.Fl c
|
|
option is a synonym for the
|
|
.Fl b
|
|
option, which causes incorrect behaviour in locales that support
|
|
multibyte characters.
|
|
.Pp
|
|
When operating on fields
|
|
.Pq Fl f No option is specified ,
|
|
.Nm
|
|
does not recognise multibyte characters, and the
|
|
.Ar delim
|
|
character is recognised in the middle of multibyte sequences.
|