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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