Pardon me, but even one liners need to enable warnings... 
$ perl -wpe '$_' file.txt
Useless use of a variable in void context at -e line 1.
...

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It should actually just be 
$ perl -wpe '' file.txt

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In reply to Re^4: Which way is recommended ? by quester
in thread Which way is recommended ? by matrixmadhan

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