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Some Perl One-liners

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        Rename htm files to html
In windows: 
>dir /B /S | perl -wlne"/([^ ]+)\.htm$/i&&rename$1.'.htm',$1.'.html'"

In linux: 
>find | grep htm | perl -wlne'/([^ ]+)\.htm$/i&&rename$1.".htm",$1.".html"'