freebsd-dev/usr.bin/head/head.1
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

79 lines
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Groff

.\" Copyright (c) 1980, 1990, 1993
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.\" @(#)head.1 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd March 16, 2013
.Dt HEAD 1
.Os
.Sh NAME
.Nm head
.Nd display first lines of a file
.Sh SYNOPSIS
.Nm
.Op Fl n Ar count | Fl c Ar bytes
.Op Ar
.Sh DESCRIPTION
This filter displays the first
.Ar count
lines or
.Ar bytes
of each of the specified files, or of the standard input if no
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.
.Sh EXIT STATUS
.Ex -std
.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
.Sh SEE ALSO
.Xr tail 1
.Sh HISTORY
The
.Nm
command appeared in PWB UNIX.