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Process Substitution in Bash

Apart from simplicity, another advantage of using process substitution is Bash will automatically parallelize your tasks. Returning to our first example…

$ diff <(curl http://somesite/file1) <(curl http://somesite/file2)

… Bash will run both those curl commands in parallel. Sweet huh?


Freek Van der Herten is a partner and developer at Spatie, an Antwerp based company that specializes in creating web apps with Laravel. After hours he writes about modern PHP and Laravel on this blog. When not coding he's probably rehearsing with his kraut rock band. He loves waffles and butterflies.