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+---
+tags:
+  - bash
+  - howto
+---
+[[Bash]] [[Parameter subsitution]] [[Null substitution]]
+
+Process substitution connects the output of a command to a file. This enables another command to accept the output of multiple commands as files if it expects files.
+
+An example of this is `diff`, which outputs the difference between two files:
+```bash
+diff <(ls dirA) <(ls dirB)
+```
+
+> Important! Don't but the <() inside quotes.. it will report: cannot find file
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