1994-05-27 12:33:43 +00:00
|
|
|
.\" Copyright (c) 1980, 1990, 1993
|
|
|
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" 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.
|
|
|
|
|
.\" 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" @(#)head.1 8.1 (Berkeley) 6/6/93
|
1999-08-28 01:08:13 +00:00
|
|
|
.\" $FreeBSD$
|
1994-05-27 12:33:43 +00:00
|
|
|
.\"
|
2013-03-17 06:57:25 +00:00
|
|
|
.Dd March 16, 2013
|
1994-05-27 12:33:43 +00:00
|
|
|
.Dt HEAD 1
|
2001-07-10 14:16:33 +00:00
|
|
|
.Os
|
1994-05-27 12:33:43 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm head
|
|
|
|
|
.Nd display first lines of a file
|
|
|
|
|
.Sh SYNOPSIS
|
2000-11-20 19:21:22 +00:00
|
|
|
.Nm
|
2002-03-15 15:28:12 +00:00
|
|
|
.Op Fl n Ar count | Fl c Ar bytes
|
2001-02-13 09:56:35 +00:00
|
|
|
.Op Ar
|
1994-05-27 12:33:43 +00:00
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
This filter displays the first
|
|
|
|
|
.Ar count
|
2001-07-15 08:06:20 +00:00
|
|
|
lines or
|
1997-04-06 00:54:27 +00:00
|
|
|
.Ar bytes
|
|
|
|
|
of each of the specified files, or of the standard input if no
|
1994-05-27 12:33:43 +00:00
|
|
|
files are specified.
|
|
|
|
|
If
|
|
|
|
|
.Ar count
|
|
|
|
|
is omitted it defaults to 10.
|
|
|
|
|
.Pp
|
|
|
|
|
If more than a single file is specified, each file is preceded by a
|
|
|
|
|
header consisting of the string
|
|
|
|
|
.Dq ==> XXX <==
|
|
|
|
|
where
|
|
|
|
|
.Dq XXX
|
|
|
|
|
is the name of the file.
|
2005-01-17 07:44:44 +00:00
|
|
|
.Sh EXIT STATUS
|
2001-08-15 09:09:47 +00:00
|
|
|
.Ex -std
|
2013-03-16 22:53:38 +00:00
|
|
|
.Sh EXAMPLES
|
|
|
|
|
To display the first 500 lines of the file
|
|
|
|
|
.Ar foo :
|
|
|
|
|
.Pp
|
|
|
|
|
.Dl $ head -n 500 foo
|
|
|
|
|
.Pp
|
|
|
|
|
.Nm
|
|
|
|
|
can be used in conjunction with
|
|
|
|
|
.Xr tail 1
|
|
|
|
|
in the following way to, for example, display only line 500 from the file
|
|
|
|
|
.Ar foo :
|
|
|
|
|
.Pp
|
|
|
|
|
.Dl $ head -n 500 foo | tail -n 1
|
1994-05-27 12:33:43 +00:00
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr tail 1
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
2000-11-20 19:21:22 +00:00
|
|
|
.Nm
|
2002-06-10 22:59:59 +00:00
|
|
|
command appeared in PWB UNIX.
|
