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  1. or download this
    laptop:~> perl -T
my @numbers = ('1','2','10','1.2','1e2','1.02e2',
...
   if ( $@ ) { print "$number isn't a number \n"; }
}
laptop:~>
  2. or download this
    laptop:~> perl -V
Summary of my perl5 (revision 5.0 version 6 subversion 1) configuratio
+n:
...
    /usr/share/perl/5.6.1
    /usr/local/lib/site_perl
    .