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Re: command line perl reading from STDIN

by AnomalousMonk (Canon)
on Jan 23, 2013 at 00:48 UTC ( #1014820=note: print w/ replies, xml ) Need Help??

in reply to command line perl reading from STDIN

Sometimes it's useful to let Perl tell you what it thinks about the code you give it to execute (e.g., "where does the fourth lineread come from?"):

>perl -MO=Deparse -ne "$s=<>;<>;<>;chomp($s);print length($s).\"\n\"; " LINE: while (defined($_ = <ARGV>)) { $s = <ARGV>; <ARGV>; <ARGV>; chomp $s; print length($s) . "\n"; } -e syntax OK

Use  -MO=Deparse,-p   for even gorier details. See B::Deparse and O.

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Re^2: command line perl reading from STDIN
by perlhappy (Novice) on Jan 31, 2013 at 16:25 UTC
    Thanks. That's really great... Really helps with understanding whats actually going on.

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