Why the $I is required in a perl script? ( Does it help the perl to handle dynamically the memory?)
Special variables like these can be looked up in perldoc perlvar, from that doc:
"$OUTPUT_AUTOFLUSH
$? If set to nonzero, forces a flush right away and after every
write or print on the currently selected output channel.
Default is 0 (regardless of whether the channel is really
buffered by the system or not; $? tells you only whether youʼve
asked Perl explicitly to flush after each write). STDOUT will
typically be line buffered if output is to the terminal and
block buffered otherwise. Setting this variable is useful pri-
marily when you are outputting to a pipe or socket, such as
when you are running a Perl program under rsh and want to see
the output as itʼs happening. This has no effect on input
buffering. See "getc" in perlfunc for that. (Mnemonic: when
you want your pipes to be piping hot.)"Get it or no?
http://danconia.org
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