To OP: do perldoc perlrun for the explaination of the -i switch including how to have it make backup copies for you.
Also, you may want * instead of *.* for _all_ (including extension-less ones) (though note that on linux that won't get hidden files)

In reply to Re^2: remove a line from a set of file in a directory by davidrw
in thread remove a line from a set of file in a directory by Anonymous Monk

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