Re: inplace file editing

[ZZamboni]

I think the difference does not have to do with the use of $^I, but with how $/=undef behaves when reading from the magic <> file handle. The following program:

$^I="";
undef $/;
while(<>) { print "hello:\n" }

Behaves the same if I comment out the $^I line: it prints "hello" twice, except that when $^I="" it is printed to the file I give as argument, obliterating it. Printing $_ on each iteration shows that $_ contains '' (empty string) on the second iteration, so my guess is that setting $/ to undef somehow changes the way in which perl reads from <>, but I don't really have an answer...

--ZZamboni

[Anonymous Monk]

sorry, what i meant to say was

$ARGV[0]="test";
$^I="";
undef $/;

while(<>) { print STDOUT "hello\n" }

(which stops hello getting printed to the file)...but it still prints twice. can ANYONE help?