$^I

[Richard Lee]

I just looked it up on perldoc perlvar, but I am still not sure what it 
does.


$^I     The current value of the inplace-edit extension.  Use "undef" 
to disable inplace editing.  (Mnemonic: value of -i
              switch.)

I was reading perl cookbook and saw this example, and was wondering what 
that is....


if (@ARGV) {
   $^I = ".orig";
} else {
    warn "$0: Reading from stdin\n" if -t STDIN;
}


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