Add support for $? variable
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- JavaScript
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Description
This would be useful for viewing the return status of functions.
Ex:
``` Bash
bash $ true
bash $ echo $?
0
bash $ false
bash $ echo $?
1
bash $ git status # assuming this isn't a git repo
fatal: Not a git repository (or any of the parent directories): .git
bash $ echo $?
128
```
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