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  1. or download this
    use strict;
use warnings;
...
} else {
    print "EGGSHELL not defined in \%ENV\n";
}
  2. or download this
    [liverpole@golux ~]% perl envtest
EGGSHELL not defined in %ENV
[liverpole@golux ~]% setenv EGGSHELL 1379
[liverpole@golux ~]% perl envtest
1379