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```
if ($var ne '')
```

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echo "foo" | perl -MCGI=param,-debug -le'defined param("foo") and prin
+t "defined!"'
# doesn't print defined! ??
...
echo "foo&" | perl -MCGI=param,-debug -le'defined param("foo") and pri
+nt "defined!"'
echo "&foo" | perl -MCGI=param,-debug -le'defined param("foo") and pri
+nt "defined!"'
# these all print defined!