Hello, all;
I am debugging code written by someone else, and noticed the following:
===START=CODE===
sub getParameters {
my $parm_list = do { local(@ARGV,$/); <> };
}
===END=CODE===
This does what the author expected (slurp STDIN into the scalar "$parm_list")
but I was surprised by the "<>" as a stand-in for <STDIN> so I looked it up.
Here is what I found:
http://perldoc.perl.org/perlvar.html
===START=PASTE===
ARGV
The special filehandle that iterates over command-line filenames in @ARGV .
Usually written as the null filehandle in the angle operator <> . Note that
currently ARGV only has its magical effect within the <> operator; elsewhere it
is just a plain filehandle corresponding to the last file opened by <> . In
particular, passing \*ARGV as a parameter to a function that expects a
filehandle may not cause your function to automatically read the contents of
all the files in @ARGV .
$ARGV
contains the name of the current file when reading from <>.
===END=PASTE===
I could find no reference to "<>" as a synonym for "<STDIN>" ... am I missing
something obvious? [The code works, so obviously it is my knowledge that is
faulty.] If someone could point me at a reference or doc or faq, I'd be
grateful.
Also, is there any particular reason (in the example given above) why '@ARGV'
would need to be localized, or is the author just being overly cautous?
Thanks, in advance, for your input!
---
Stephen ~runester~ Jarjoura
http://runester.com
http://boston.pm.org/kwiki/index.cgi?StephenJarjoura
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