
****
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**\ :


.. code-block:: perl

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


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


.. code-block:: perl

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


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


.. code-block:: perl

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


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


.. code-block:: perl

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


The commands to run can be an array:


.. code-block:: perl

   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:


.. code-block:: perl

   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:


.. code-block:: perl

   seq 10 | parset res echo Does not work


but must instead use a tempfile:


.. code-block:: perl

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


or a FIFO:


.. code-block:: perl

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


or Bash/Zsh/Ksh process substitution:


.. code-block:: perl

   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**\ :


.. code-block:: perl

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


E.g. by doing:


.. code-block:: perl

   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:


.. code-block:: perl

   env_parallel --install




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


Examples
--------


ash does not support arrays.

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


.. code-block:: perl

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


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


.. code-block:: perl

   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:


.. code-block:: perl

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


but must instead use a tempfile:


.. code-block:: perl

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


or a FIFO:


.. code-block:: perl

   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**\ :


.. code-block:: perl

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


E.g. by doing:


.. code-block:: perl

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


or by doing:


.. code-block:: perl

   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.

This helps funding further development; and it won't cost you a cent. If you pay 10000 EUR you should feel free to use GNU Parallel without citing.

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

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

Copyright (C) 2010-2023 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**\ 
 
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- \ **to Remix**\ 
 
 to adapt the work
 


Under the following conditions:


- \ **Attribution**\ 
 
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 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**\ 
 
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- \ **Public Domain**\ 
 
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- \ **Other Rights**\ 
 
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 - 
  
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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).

