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43 lines
1.2 KiB
Plaintext
43 lines
1.2 KiB
Plaintext
---
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syntax: markdown
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tags: [tldr, common]
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source: https://github.com/tldr-pages/tldr.git
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---
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# parallel
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> Run commands on multiple CPU cores.
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> See also: `xargs`.
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> More information: <https://www.gnu.org/software/parallel/man.html>.
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- Gzip several files at once, using all cores:
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`parallel gzip ::: {{path/to/file1 path/to/file2 ...}}`
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- Read arguments from `stdin`, run 4 jobs at once:
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`ls *.txt | parallel {{[-j|--jobs]}} 4 gzip`
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- Convert JPEG images to PNG using replacement strings:
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`parallel convert {} {.}.png ::: *.jpg`
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- Parallel xargs, cram as many args as possible onto one command:
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`{{args}} | parallel -X {{command}}`
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- Break `stdin` into ~1M blocks, feed each block to `stdin` of new command:
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`cat {{big_file.txt}} | parallel --pipe --block 1M {{command}}`
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- Run on multiple machines via SSH:
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`parallel {{[-S|--sshlogin]}} {{machine1}},{{machine2}} {{command}} ::: {{arg1}} {{arg2}}`
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- Download 4 files simultaneously from a text file containing links showing progress:
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`parallel {{[-j|--jobs]}} 4 --bar --eta curl {{[-sO|--silent --remote-name]}} {} :::: {{path/to/links.txt}}`
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- Print the jobs which `parallel` is running in `stderr`:
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`parallel {{[-t|--verbose]}} {{command}} ::: {{args}}`
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