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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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