GNU parset

NAME
parset - set shell variables in parallelSYNOPSIS
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 thevariable 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.

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

SUPPORTED SHELLS
Bash/Zsh/Ksh/Mksh
ExamplesPut output into myarray:parset myarray seq 3 ::: 4 5 6echo "${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 "$ls"
Put output into associative array myassoc (not supported for mksh):
typeset -A myassoc
parset myassoc seq ::: 4 5 ::: 6 7echo "${myassoc[4 7]}"The commands to run can be an array:
cmd=("echo first" "echo '<<joeparset data ::: "${cmd[@]}"
echo "${data[1]}"echo "${data[2]}"\"double

space\"

cartoon>>'" "pwd")

parset can read from stdin (standard input) if it is a file:
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GNU parset
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 apipe:
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 --installash/dash (FreeBSD's /bin/sh)
Examplesash 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:

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GNU parset
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 apipe:
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.
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) 2010-2024 Ole Tange, http://ole.tange.dk and Free Software Foundation, Inc.

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GNU parset

LICENSEThis 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 theLicense, or at your option any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; withouteven 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 theGNU 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 Shareto 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 notin any way that suggests that they endorse you or your use of the work).
Share AlikeIf 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:
WaiverAny of the above conditions can be waived if you get permission from the copyrightholder.
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 andlimitations;
The author's moral rights;
Rights other persons may have either in the work itself or in how the work isused, such as publicity or privacy rights.
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GNU parset
For any reuse or distribution, you must make clear to others the license terms of thiswork.
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).

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