Editing Parallel

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<code>[[wikipedia:GNU_parallel|parallel]]</code><ref>https://www.gnu.org/software/parallel/man.html</ref> allows the user to execute shell scripts or [[commands]] in parallel.

 [[brew install parallel]]

== Examples ==
 [[aws ec2 describe-regions]] --query "Regions[].{Name:RegionName}" --output text | [[parallel]] "echo {}; [[aws ec2 describe-instances]] --region {}"


 your_command | parallel "echo {}; your_command2 {}"

 ls | parallel git -C {} [[git fetch|fetch]]
 ls | parallel git -C {} [[git pull|pull]]

== Activities ==
=== Basic ===
# [[Execute a command in parallel by ssh]] in MACHINE1 and MACHINE2 using parallel
# Read stackexchange questions about gnu-parallel: https://unix.stackexchange.com/questions/tagged/gnu-parallel?tab=votes&pagesize=50
# Install parallel in macOS: <code>[[brew install parallel]]</code> can conflict with <code>[[brew install]] [[moreutils]]</code>

=== Intermediate ===
# Review different parallel options such as: <code>--keep-order</code> or <code>-k</code> which keep order in the output. Do not affect order of execution.
# Update all your <code>[[git]]</code> repositories in a directory in macOS using parallel: <code>ls | parallel git -C {} fetch </code>

== Related terms ==
* [[Parallels]]
* <code>[[for]]</code>
* <code>[[pssh]]</code>
* <code>[[parallel --citation]]</code>
* <code>[[yarn workspaces foreach]] --paralell</code>
* [[PostgreSQL parallel query]]
* [[Android parallel apps]]
* [[Parallel computing]]
* [[ansible -B]], [[--background]]
* [[parallel --sshlogin]]
* [[pigz]], [[gipz]] parallel implementation

== See also ==
* {{parallel}}
* {{xargs}}
* <code>{{moreutils}}</code>
* {{stress}}
* {{CPU}}

[[Category:Linux]]

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Source: https://en.wikiversity.org/wiki/Linux/Basic_commands/parallel