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Don't set the hook to map undefined variables by default.#6

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AitorATuin wants to merge 3 commits intozserge:masterfrom
AitorATuin:feature/optional_variable_hook
Open

Don't set the hook to map undefined variables by default.#6
AitorATuin wants to merge 3 commits intozserge:masterfrom
AitorATuin:feature/optional_variable_hook

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@AitorATuin
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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()

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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