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Re^3: <> oddity ?

by LanX (Canon)
on Mar 27, 2013 at 10:48 UTC ( #1025673=note: print w/ replies, xml ) Need Help??


in reply to Re^2: <> oddity ?
in thread <> oddity ?

you're right

from perlop

       The null filehandle <> is special: it can be used to emulate the
       behavior of sed and awk.  Input from <> comes either from standard
       input, or from each file listed on the command line.  Here’s how it
       works: the first time <> is evaluated, the @ARGV array is checked, and
       if it is empty, $ARGV[0] is set to "-", which when opened gives you
       standard input.  The @ARGV array is then processed as a list of
       filenames.  The loop

while (<>) { ... # code for each line }

is equivalent to the following Perl-like pseudo code:

unshift(@ARGV, '-') unless @ARGV; while ($ARGV = shift) { open(ARGV, $ARGV); while (<ARGV>) { ... # code for each line } }

Cheers Rolf

( addicted to the Perl Programming Language)


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