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#!/usr/bin/perl
use warnings;
...
print "From myHash --> $key => $value\n";
}

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Global symbol "%envPropertiesHash" requires explicit package name at f
+irst.pl line 5.
Global symbol "$envPropertiesHash" requires explicit package name at f
+irst.pl line 22.
Global symbol "%envPropertiesHash" requires explicit package name at f
+irst.pl line 31.
Execution of first.pl aborted due to compilation errors.