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  1. or download this
    #!/usr/bin/perl -w

print " I was called as $0\n";
  2. or download this
    [xxxx@yyy:/home/xxxx]$ tt
 I was called as ./tt
[xxxx@yyy:/home/xxxx]$ rr
 I was called as /usr/local/bin/rr
[xxxx@yyy:/home/xxxx]$