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Re: How does while works with filehandles?

by rjt (Deacon)
on Dec 02, 2012 at 18:40 UTC ( #1006744=note: print w/ replies, xml ) Need Help??

in reply to How does while works with filehandles?

Have a look at the examples in Perl I/O Operators. I'd recommend you read the entire section, but the most relevant snippets that most directly answer your question are probably:

In scalar context, evaluating a filehandle in angle brackets yields the next line from that file (the newline, if any, included), or undef at end-of-file or on error.
The following lines are equivalent:
while (defined($_ = <STDIN>)) { print; } while ($_ = <STDIN>) { print; } while (<STDIN>) { print; } for (;<STDIN>;) { print; } print while defined($_ = <STDIN>); print while ($_ = <STDIN>); print while <STDIN>;

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