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  1. or download this
      zen% perl -we 'printf "<%4.4d>\n", "42a"'
  Argument "42a" isn't numeric in printf at -e line 1.
  <0042>
  zen%
  2. or download this
      zen% /opt/perl-5.6.0/bin/perl -we 'printf "<%4.4d>\n", "42a"'
  Argument "42a" isn't numeric in printf at -e line 1.
  <0000>
  zen%