9da32e3d93
Fixes (on linux), for example for the ninja formula test:
```
pgrep
-P
83252
{out: :close}}
Invalid preceding regular expressionpgrep: write error: Bad file descriptor
Error: ninja: failed
An exception occurred within a child process:
BuildError: Failed executing: pgrep -P 83252 {out: :close}
```
Using File:NULL is more portable.
Library
This directory contains all the code run by the official brew and brew cask commands in Homebrew and all formulae (package descriptions) in taps (repositories containing formulae) in Taps subdirectories.