Hi, new questions go in Seekers Of Perl Wisdom because
telemachus, whom you asked a question, hasn't been here in 10 weeks.
The node to which you replied is 2+ years old.
Welcome, see The Perl Monks Guide to the Monastery, see How do I post a question effectively?, Where should I post X?
See perlintro, Tutorials: Pattern Matching, Regular Expressions, and Parsing, perlretut, FMTYEWTK About Mass Edits In Perl, Uncommon* but Useful Perl Command Line Options for One-liners, Re^2: perl -pi -e s'/^\s+//'g $file
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