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Annotation of src/usr.bin/head/head.1, Revision 1.11

1.11    ! millert     1: .\"    $OpenBSD: head.1,v 1.10 2000/11/10 05:10:29 aaron Exp $
1.7       aaron       2: .\"
1.1       deraadt     3: .\" Copyright (c) 1980, 1990 The Regents of the University of California.
                      4: .\" All rights reserved.
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                      6: .\" Redistribution and use in source and binary forms, with or without
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                      9: .\" 1. Redistributions of source code must retain the above copyright
                     10: .\"    notice, this list of conditions and the following disclaimer.
                     11: .\" 2. Redistributions in binary form must reproduce the above copyright
                     12: .\"    notice, this list of conditions and the following disclaimer in the
                     13: .\"    documentation and/or other materials provided with the distribution.
1.11    ! millert    14: .\" 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    15: .\"    may be used to endorse or promote products derived from this software
                     16: .\"    without specific prior written permission.
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                     18: .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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                     25: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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                     30: .\"    from: @(#)head.1        6.6 (Berkeley) 7/24/91
                     31: .\"
                     32: .Dd July 14, 1993
                     33: .Dt HEAD 1
                     34: .Os
                     35: .Sh NAME
                     36: .Nm head
1.4       aaron      37: .Nd display first few lines of files
1.1       deraadt    38: .Sh SYNOPSIS
                     39: .Nm head
1.4       aaron      40: .Oo
                     41: .Fl Ns Ar count No \&|
                     42: .Fl n Ar count
                     43: .Oc
1.1       deraadt    44: .Op Ar
                     45: .Sh DESCRIPTION
1.4       aaron      46: The
                     47: .Nm
                     48: utility copies the first
1.1       deraadt    49: .Ar count
1.4       aaron      50: lines of each specified
                     51: .Ar file
                     52: to the standard output.
1.5       aaron      53: If no files are named,
1.4       aaron      54: .Nm
                     55: copies lines from the standard input.
1.1       deraadt    56: If
                     57: .Ar count
1.4       aaron      58: is omitted, it defaults to 10.
                     59: .Pp
                     60: The options are as follows:
                     61: .Bl -tag -width Ds
                     62: .It Xo Fl Ns Ar count No \&|
                     63: .Fl n Ar count
                     64: .Xc
                     65: Copy the first
                     66: .Ar count
                     67: lines of each input file to the standard output.
                     68: .Ar count
                     69: must be a positive decimal integer.
                     70: .El
                     71: .Pp
                     72: If more than one file is specified,
                     73: .Nm
                     74: precedes the output of each file with the following, in order to distinguish
                     75: the head of each file:
                     76: .Pp
                     77: .Dl ==> Ar file No <==
                     78: .Sh EXAMPLES
                     79: To display the first 500 lines of the file
                     80: .Ar foo :
                     81: .Pp
                     82: .Dl $ head -500 foo
                     83: .Pp
                     84: .Nm
                     85: can be used in conjunction with
                     86: .Xr tail 1
                     87: in the following way to, for example, display only line 500 from the file
                     88: .Ar foo :
                     89: .Pp
                     90: .Dl $ head -500 foo | tail -1
1.1       deraadt    91: .Sh SEE ALSO
1.4       aaron      92: .Xr cat 1 ,
                     93: .Xr less 1 ,
                     94: .Xr more 1 ,
1.1       deraadt    95: .Xr tail 1
1.10      aaron      96: .Sh COMPATIBILITY
                     97: The historic command line syntax is supported by this implementation.
1.1       deraadt    98: .Sh STANDARDS
1.3       aaron      99: The
                    100: .Nm
1.1       deraadt   101: utility conforms to
                    102: .St -p1003.2-92 .
                    103: .Sh HISTORY
                    104: The
1.3       aaron     105: .Nm
1.1       deraadt   106: utility appeared in
                    107: .Bx 3.0 .