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  1. or download this
    use Env;
use strict;
...
root@whitebox:/tmp# perl testEnv.pl
/bin/bash
  2. or download this
    use Env;
use strict;
...
root@whitebox:/tmp# perl testEnv.pl
Global symbol "$EGGSHELL" requires explicit package name at testEnv.pl
+ line 4.
Execution of testEnv.pl aborted due to compilation errors.