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Re: one-liner hogs

by jynx (Priest)
on Feb 01, 2001 at 04:01 UTC ( #55606=note: print w/ replies, xml ) Need Help??

in reply to one-liner hogs

And how about one for disk hoggage:

perl -e '(open T "/tmp/f.$t" and print T "disk\n"x256; close T) while +(++$t);'
That should work. If not a little variation should be close enough. There are probably more efficient ways to do this, but that's the first thing off the top of my head...


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Re: Re: one-liner hogs
by baku (Scribe) on Feb 01, 2001 at 22:22 UTC

    For disc overflows:

    not perl, but works:

    cat /dev/zero > /tmp/.#overflow#

    Of course, could also be

    perl -e 'open T,">/tmp/.#overflow#";open F,"</dev/zero";while(<F>){pri +nt T;};'

    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 +}}};'

    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>;
      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}}};


        cat /dev/zero > /tmp/kill.system

        Less effective, but easier to type. And probably a good way to muck up 90% of systems :-)

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