210 lines
5.2 KiB
Groff
210 lines
5.2 KiB
Groff
.\" $NetBSD: cat.1,v 1.32 2006/09/23 11:24:44 wiz Exp $
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.\"
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.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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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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.\" @(#)cat.1 8.3 (Berkeley) 5/2/95
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.\"
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.Dd September 23, 2006
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.Dt CAT 1
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.Os
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.Sh NAME
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.Nm cat
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.Nd concatenate and print files
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.Sh SYNOPSIS
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.Nm
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.Op Fl beflnstuv
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.Op Fl
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility reads files sequentially, writing them to the standard output.
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The
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.Ar file
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operands are processed in command line order.
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A single dash represents the standard input,
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and may appear multiple times in the
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.Ar file
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list.
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.Pp
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The word
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.Dq concatenate
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is just a verbose synonym for
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.Dq catenate .
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl b
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Implies the
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.Fl n
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option but doesn't number blank lines.
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.It Fl e
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Implies the
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.Fl v
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option, and displays a dollar sign
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.Pq Ql \&$
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at the end of each line
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as well.
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.It Fl f
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Only attempt to display regular files.
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.It Fl l
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Set an exclusive advisory lock on the standard output file descriptor.
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This lock is set using
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.Xr fcntl 2
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with the
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.Dv F_SETLKW
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command.
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If the output file is already locked,
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.Nm
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will block until the lock is acquired.
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.It Fl n
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Number the output lines, starting at 1.
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.It Fl s
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Squeeze multiple adjacent empty lines, causing the output to be
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single spaced.
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.It Fl t
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Implies the
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.Fl v
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option, and displays tab characters as
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.Ql ^I
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as well.
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.It Fl u
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The
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.Fl u
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option guarantees that the output is unbuffered.
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.It Fl v
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Displays non-printing characters so they are visible.
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Control characters print as
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.Ql ^X
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for control-X; the delete
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character (octal 0177) prints as
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.Ql ^? .
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Non-ascii characters (with the high bit set) are printed as
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.Ql M-
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(for meta) followed by the character for the low 7 bits.
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.El
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.Sh EXIT STATUS
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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 EXAMPLES
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The command:
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.Bd -literal -offset indent
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.Ic cat file1
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.Ed
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.Pp
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will print the contents of
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.Ar file1
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to the standard output.
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.Pp
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The command:
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.Bd -literal -offset indent
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.Ic cat file1 file2 \*[Gt] file3
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.Ed
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.Pp
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will sequentially print the contents of
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.Ar file1
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and
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.Ar file2
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to the file
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.Ar file3 ,
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truncating
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.Ar file3
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if it already exists.
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See the manual page for your shell (i.e.,
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.Xr sh 1 )
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for more information on redirection.
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.Pp
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The command:
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.Bd -literal -offset indent
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.Ic cat file1 - file2 - file3
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.Ed
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.Pp
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will print the contents of
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.Ar file1 ,
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print data it receives from the standard input until it receives an
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.Dv EOF
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.Pq Sq ^D
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character, print the contents of
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.Ar file2 ,
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read and output contents of the standard input again, then finally output
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the contents of
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.Ar file3 .
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Note that if the standard input referred to a file, the second dash
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on the command-line would have no effect, since the entire contents of the file
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would have already been read and printed by
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.Nm
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when it encountered the first
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.Ql \&-
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operand.
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.Sh SEE ALSO
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.Xr head 1 ,
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.Xr hexdump 1 ,
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.Xr lpr 1 ,
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.Xr more 1 ,
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.Xr pr 1 ,
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.Xr tail 1 ,
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.Xr view 1 ,
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.Xr vis 1 ,
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.Xr fcntl 2
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.Rs
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.%A Rob Pike
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.%T "UNIX Style, or cat -v Considered Harmful"
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.%J "USENIX Summer Conference Proceedings"
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.%D 1983
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.Re
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.Sh STANDARDS
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The
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.Nm
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utility is expected to conform to the
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.St -p1003.2-92
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specification.
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.Pp
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The flags
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.Op Fl belnstv
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are extensions to the specification.
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v1 .
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Dennis Ritchie designed and wrote the first man page.
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It appears to have been
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.Xr cat 1 .
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.Sh BUGS
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Because of the shell language mechanism used to perform output
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redirection, the command
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.Dq Li cat file1 file2 \*[Gt] file1
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will cause the original data in file1 to be destroyed!
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This is performed by the shell before
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.Nm
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is run.
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