NAME

       parset - set shell variables in parallel

SYNOPSIS

       parset variablename [options for GNU Parallel]

       env_parset variablename [options for GNU Parallel]

DESCRIPTION

       parset is a shell function that puts the output from GNU parallel into shell variables.

       env_parset is a shell function that puts the output from env_parallel into shell variables.

       The parset and env_parset functions are defined as part of env_parallel.

       If variablename is a single variable name, this will be treated as the destination variable. If the
       variable is defined as an associative array (using typeset -A myassoc), this will be used. Otherwise the
       variable will be made into a normal array.

       If variablename contains multiple names separated by ',' or space, the names will be the destination
       variables. The number of names must be at least the number of jobs.

OPTIONS

       Same as GNU parallel, but they are put after the destination variable.

SUPPORTED SHELLS

   Bash/Zsh/Ksh/Mksh
       Examples

       Put output into myarray:

         parset myarray seq 3 ::: 4 5 6
         echo "${myarray[1]}"

       Put output into vars $seq, $pwd, $ls:

         parset "seq pwd ls" ::: "seq 10" pwd ls
         echo "$ls"

       Put output into vars $seq, $pwd, $ls:

         into_vars=(seq pwd ls)
         parset "${into_vars[*]}" ::: "seq 10" pwd ls
         echo "$ls"

       Put output into associative array myassoc (not supported for mksh):

         typeset -A myassoc
         parset myassoc seq ::: 4 5 ::: 6 7
         echo "${myassoc[4 7]}"

       The commands to run can be an array:

         cmd=("echo first" "echo '<<joe  \"double  space\"  cartoon>>'" "pwd")
         parset data ::: "${cmd[@]}"
         echo "${data[1]}"
         echo "${data[2]}"

       parset can read from stdin (standard input) if it is a file:

         parset res echo < parallel_input_file

       but parset can not be part of a pipe. In particular this means it cannot read from a pipe or write to a
       pipe:

         seq 10 | parset res echo Does not work

       but must instead use a tempfile:

         seq 10 > parallel_input
         parset res echo :::: parallel_input
         echo "${res[1]}"
         echo "${res[9]}"

       or a FIFO:

         mkfifo input_fifo
         seq 30 > input_fifo &
         parset res echo :::: input_fifo
         echo "${res[1]}"
         echo "${res[29]}"

       or Bash/Zsh/Ksh process substitution:

         parset res echo :::: <(seq 100)
         echo "${res[1]}"
         echo "${res[99]}"

       Installation

       Put this in the relevant $HOME/.bashrc or $HOME/.zshenv or $HOME/.kshrc:

         . `which env_parallel.bash`
         . `which env_parallel.zsh`
         source `which env_parallel.ksh`

       E.g. by doing:

         echo '. `which env_parallel.bash`' >> $HOME/.bashrc
         echo '. `which env_parallel.zsh`' >> $HOME/.zshenv
         echo 'source `which env_parallel.ksh`' >> $HOME/.kshrc

       or by doing:

         env_parallel --install

   ash/dash (FreeBSD's /bin/sh)
       Examples

       ash does not support arrays.

       Put output into vars $seq, $pwd, $ls:

         parset "seq pwd ls" ::: "seq 10" pwd ls
         echo "$ls"

       parset can read from stdin (standard input) if it is a file:

         parset res1,res2,res3 echo < parallel_input_file

       but parset can not be part of a pipe. In particular this means it cannot read from a pipe or write to a
       pipe:

         seq 3 | parset res1,res2,res3 echo Does not work

       but must instead use a tempfile:

         seq 3 > parallel_input
         parset res1,res2,res3 echo :::: parallel_input
         echo "$res1"
         echo "$res2"
         echo "$res3"

       or a FIFO:

         mkfifo input_fifo
         seq 3 > input_fifo &
         parset res1,res2,res3 echo :::: input_fifo
         echo "$res1"
         echo "$res2"
         echo "$res3"

       Installation

       Put the relevant one of these into $HOME/.profile:

         . `which env_parallel.sh`
         . `which env_parallel.ash`
         . `which env_parallel.dash`

       E.g. by doing:

         echo '. `which env_parallel.ash`' >> $HOME/.bashrc

       or by doing:

         env_parallel --install

EXIT STATUS

       Same as GNU parallel.

AUTHOR

       When using GNU parallel for a publication please cite:

       O. Tange (2011): GNU Parallel - The Command-Line Power Tool, ;login: The USENIX Magazine, February
       2011:42-47.

       Copyright (C) 2007-10-18 Ole Tange, http://ole.tange.dk

       Copyright (C) 2008-2010 Ole Tange, http://ole.tange.dk

       Copyright (C) 2010-2024 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 LICENSES/GFDL-1.3-or-later.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:

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

                • The author's moral rights;

                • 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 LICENCES/CC-BY-SA-4.0.txt

DEPENDENCIES

       parset uses GNU parallel.

SEE ALSO

       parallel(1), env_parallel(1), bash(1).