98 lines
2.8 KiB
Groff
98 lines
2.8 KiB
Groff
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.\" $NetBSD: head.1,v 1.12 2004/05/04 23:44:21 wiz Exp $
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.\"
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.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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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. 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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.\" from: @(#)head.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd May 4, 2004
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.Dt HEAD 1
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.Os
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.Sh NAME
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.Nm head
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.Nd display first lines of a file
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.Sh SYNOPSIS
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.Nm
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.Op Fl qv
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.Op Fl n Ar count
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.Op Fl c Ar byte_count
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.Op Ar file ...
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.Sh DESCRIPTION
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This filter displays the first
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.Ar count
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lines of each of the specified files, or of the standard input if no
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files are specified.
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If
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.Ar count
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is omitted it defaults to 10.
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If
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.Fl c Ar byte_count
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is specified,
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.Nm
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counts bytes instead of lines.
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.Pp
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If more than a single file is specified, or the
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.Fl v
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option is used, each file is preceded by a header consisting of the string
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.Dq ==\*[Gt] XXX \*[Le]=
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where
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.Dq XXX
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is the name of the file.
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The
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.Fl q
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flag disables the printing of the header in all cases.
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.Pp
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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 COMPATIBILITY
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The historic command line syntax of
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.Nm
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is supported by this implementation.
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.Pp
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This command is mostly compatible with GNU extensions to
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.Nm .
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.Sh SEE ALSO
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.Xr tail 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 HISTORY
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The
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.Nm
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utility appeared in
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.Bx 3.0 .
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It was enhanced to include the
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.Fl c ,
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.Fl q ,
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and
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.Fl v
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options for
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.Nx 2.1 .
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