For disc overflows:

not perl, but works:

cat /dev/zero > /tmp/.#overflow#
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Of course, could also be

perl -e 'open T,">/tmp/.#overflow#";open F,"</dev/zero";while(<F>){pri
+nt T;};'
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Or the 'smarter'(?) way to completely overflow a machine (but probably only as root):

perl -e 'open M,"/sbin/mount|grep -v':'";while(<M>){($m)=split($_);if(
+fork){open Z,"</dev/zero";open F,">$m/.#overflow#";while(<Z>){print F
+}}};'
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But that's WAY too much to memorize, da?

Ah, I think you've accidentally stumbled upon an obfuscated hog of a different kind. Consider:

open(ZERO,"</dev/zero") or die $!;
my $x= <ZERO>;
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I think I'll let someone else explain what that does so people have a little time to think about it. (:
        - tye (but my friends call me "Tye")

Serves me right for working on a machine with no /dev/zero.... argh.

The <> operator will seek $/, never find it, and just fill memory to the rlimit. Not great for a disc test.

That makes the 'line' read:

perl -e 'open M,"/sbin/mount|grep -v':'";while(<M>){($m)=split($_);
if(fork){open Z,"</dev/zero";open F,">$m/.#overflow#";while(read(Z,
$x,4096)){print F $x}}};
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Bleh.

cat /dev/zero > /tmp/kill.system
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Less effective, but easier to type. And probably a good way to muck up 90% of systems :-)