(TIL) Nix: Create A File Descriptor with Process Substitution

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Process substitution can be used to create a file descriptor from the evaluation of a shell command. The syntax for process substitution is <(LIST) where LIST is one or more bash commands.

$ cat <(echo 'hello, world')
hello, world

This is particularly useful for commands that expect files, such as diff:

$ diff <(echo 'hello, world') <(echo 'hello, mars')
1c1
< hello, world
---
> hello, mars

Via jbranchaud/til.

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