$ curl cheat.sh/

# 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 ::: file1 file2 file3

# 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

$

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