parset - set shell variables in parallel
parset variablename [options for GNU Parallel]
env_parset variablename [options for GNU Parallel]
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.
Same as GNU parallel, but they are put after the destination variable.
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 "${data[2]}"parset can read from stdin (standard input) if it is a file:
parset res echo < parallel_input_filebut parset can not be part of a pipe. In particular this means it cannot read from a pipe or write to a pipe:
seq 10 | parset res echo Does not workbut must instead use a tempfile:
seq 10 > parallel_input
parset res echo :::: parallel_input
echo "${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]}"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/.kshrcor by doing:
env_parallel --installash 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_filebut 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 workbut 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"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/.bashrcor by doing:
env_parallel --installSame as GNU parallel.
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) 2010-2022 Ole Tange, http://ole.tange.dk and Free Software Foundation, Inc.
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.
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parset uses GNU parallel.
parallel(1), env_parallel(1), bash(1).