Don't set the hook to map undefined variables by default. #6
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While this is a nice feature when using lua as a pure shell script
language when using luash as a module to run shell commands embedded in
another program it's undesirable not to have undefined variables.
That feature can be enabled at any time calling the `install` function
provided by the module or at `require` time as:
```
local sh = require('sh').install()
```
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While this is a nice feature when using lua as a pure shell script
language, when using
luashas a module to run shell commands embedded inanother program it's undesirable not to have undefined variables.
That feature can be enabled at any time calling the
installfunctionprovided by the module or at
requiretime as: