2 examples for parallel

  # Runs the gzip command on all the *.txt files in the current directory, in parallel
parallel gzip ::: *.txt
        

  # http://qbrc.swmed.edu/2013/03/gnu-parallel-speeding-up-unix-commands-and-scripts/
# search for all files that end with .txt and then match a word within each file
find . -name “*.txt” | parallel grep “matching word”