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PARSET(1) parallel PARSET(1) 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. 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) 2010-2025 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). 20250122 2025-01-21 PARSET(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SUPPORTED SHELLS | EXIT STATUS | AUTHOR | LICENSE | DEPENDENCIES | SEE ALSO
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