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

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:

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