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  1. or download this
    perl -pi -00 -e 's{(<TITLE.*?>).*?(<\/TITLE>)}[$1newtitle$2]gis' *.htm
    +l
    
  2. or download this
    while(<>) { ..... }
    
  3. or download this
    perl -pi -e 's{^#!\/.*?$}[#!\/usr\/bin\/perl];' *.pl