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Updated: Wednesday, February 9, 2022
 
 

parcat (1)

Name

parcat - cat files or fifos in parallel

Synopsis

parcat [--rm] [-#] file(s) [-#] file(s)

Description

PARCAT(1)                          parallel                          PARCAT(1)



NAME
       parcat - cat files or fifos in parallel

SYNOPSIS
       parcat [--rm] [-#] file(s) [-#] file(s)

DESCRIPTION
       GNU parcat reads files or fifos in parallel. It writes full lines so
       there will be no problem with mixed-half-lines which you risk if you
       use:

          (cat file1 & cat file2 &) | ...

       Arguments can be given on the command line or passed in on stdin
       (standard input).

OPTIONS
       -#       Arguments following this will be sent to the file descriptor
                #. E.g.

                  parcat -1 stdout1 stdout2 -2 stderr1 stderr2

                will send stdout1 and stdout2 to stdout (standard output =
                file descriptor 1), and send stderr1 and stderr2 to stderr
                (standard error = file descriptor 2).

       --rm     Remove files after opening. As soon as the files are opened,
                unlink the files.

EXAMPLES
   Simple line buffered output
       GNU parallel saves output to tempfiles. If the amount of data is bigger
       than the free disk space, then you can use this technique to do line
       buffering without saving to disk:

         mkfifo slot-{1..5}
         seq 10000000 | parallel -j5 --round --pipe 'cat > slot-{%}' &
         parcat slot-{1..5} | wc

REPORTING BUGS
       GNU parcat is part of GNU parallel. Report bugs to
       <bug-parallel@gnu.org>.

AUTHOR
       Copyright (C) 2016-2020 Ole Tange, http://ole.tange.dk and Free
       Software Foundation, Inc.

LICENSE
       This program is free software; you can redistribute it and/or modify it
       under the terms of the GNU General Public License as published by the
       Free Software Foundation; either version 3 of the License, or at your
       option any later version.

       This program is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.

       You should have received a copy of the GNU General Public License along
       with this program.  If not, see <http://www.gnu.org/licenses/>.

   Documentation license I
       Permission is granted to copy, distribute and/or modify this
       documentation under the terms of the GNU Free Documentation License,
       Version 1.3 or any later version published by the Free Software
       Foundation; with no Invariant Sections, with no Front-Cover Texts, and
       with no Back-Cover Texts.  A copy of the license is included in the
       file fdl.txt.

   Documentation license II
       You are free:

       to Share to copy, distribute and transmit the work

       to Remix to adapt the work

       Under the following conditions:

       Attribution
                You must attribute the work in the manner specified by the
                author or licensor (but not in any way that suggests that they
                endorse you or your use of the work).

       Share Alike
                If you alter, transform, or build upon this work, you may
                distribute the resulting work only under the same, similar or
                a compatible license.

       With the understanding that:

       Waiver   Any of the above conditions can be waived if you get
                permission from the copyright holder.

       Public Domain
                Where the work or any of its elements is in the public domain
                under applicable law, that status is in no way affected by the
                license.

       Other Rights
                In no way are any of the following rights affected by the
                license:

                o        Your fair dealing or fair use rights, or other
                         applicable copyright exceptions and limitations;

                o        The author's moral rights;

                o        Rights other persons may have either in the work
                         itself or in how the work is used, such as publicity
                         or privacy rights.

       Notice   For any reuse or distribution, you must make clear to others
                the license terms of this work.

       A copy of the full license is included in the file as cc-by-sa.txt.

DEPENDENCIES
       GNU parcat uses Perl.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       +---------------+------------------+
       |ATTRIBUTE TYPE | ATTRIBUTE VALUE  |
       +---------------+------------------+
       |Availability   | shell/parallel   |
       +---------------+------------------+
       |Stability      | Uncommitted      |
       +---------------+------------------+

SEE ALSO
       cat(1), parallel(1)



NOTES
       Source code for open source software components in Oracle Solaris can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at
       https://github.com/oracle/solaris-userland.  The original community
       source was downloaded from
       https://ftp.gnu.org/gnu/parallel/parallel-20200322.tar.bz2.

       Further information about this software can be found on the open source
       community website at https://www.gnu.org/software/parallel.



20200122                          2020-01-27                         PARCAT(1)