Represented in bash script:

```bash
if [[ ! -z $Zip ]] ; then  # if the variable $Zip is not empty (has been set/used) then
    if [[ $Zop == true ]] ; then  # if variable Zop is true
        Zap = Zip # Then Zap equals Zip
    fi
fi

Zup = Zip # Zup always equals Zip
```

In the above example, Zap will only do Zip if Zip has been "used" previously. Zup appears to simply be an alias for Zip.
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