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tldr/pages/common/parallel.md
Vitor Henrique e7d5609dd3
pages*: improve list placeholders and wording of descriptions (#12111)
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Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
2024-01-31 09:25:19 +05:30

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# parallel
> Run commands on multiple CPU cores.
> More information: <https://www.gnu.org/software/parallel>.
- Gzip several files at once, using all cores:
`parallel gzip ::: {{path/to/file1 path/to/file2 ...}}`
- Read arguments from `stdin`, run 4 jobs at once:
`ls *.txt | parallel -j4 gzip`
- Convert JPG images to PNG using replacement strings:
`parallel convert {} {.}.png ::: *.jpg`
- Parallel xargs, cram as many args as possible onto one command:
`{{args}} | parallel -X {{command}}`
- Break `stdin` into ~1M blocks, feed each block to `stdin` of new command:
`cat {{big_file.txt}} | parallel --pipe --block 1M {{command}}`
- Run on multiple machines via SSH:
`parallel -S {{machine1}},{{machine2}} {{command}} ::: {{arg1}} {{arg2}}`