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Obfuscated code

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Got some code which would take a Perl grand master to understand without running it? Post it in this section so we can stare at it in awe.

Word of warning, though: Don't be too cocky with your post — almost inevitably someone will post a reply that does the exact same thing in even fewer characters!

New Less than Readable Code
Polybius JAPH
1 direct reply — Read more / Contribute
by teamster_jr
on Apr 29, 2015 at 11:36
    $_ =q#( $.=" 20 2c4a 506 175" )=~s {[ \W] ?([ \w] )\s ?(\w ) }{ $ |= 1 ; "0x$ 1$2 ".( 5 - (++$ b)? " ," :".. " ) }xeg ;$ l=~ s { \s}{ ; ""}exg;@t=split //, "\44_ =q\43$_\43; s/\134\156//xg; eval ".($"x2)."\43TSR'15";map{ $ a[$c /5] [$c++%5] =chr } eval $ .; do {$s += 1; my $ z; if ($t [$s ] eq $"){($ d++% 2 ?$x: $ y )=$ s- $e;$e= $s+ 1;if( !($ d-2) ){$ d=0; push @j,$ a[$ x ][$ y] } } }while@j-25; print join $ /, unpack ("( A69)*" , join"" ,@ t ), join "",$ /, (m ap{( "\43", @$_,$ /) }@ a),"\n\43 ",@j,$/;#; s/\n//xg; eval #TSR'15
JAPH does the splits
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by Schmunzie
on Apr 12, 2015 at 19:14
    My first JAPH for years and years. I'm not sure if this is platform-independent. I hope it is.
    @z=split(//,BGu6pCozwKzR);@y=qw(zlz hqa zuo reg rqz fpx 72 26 25 53 25 + 06);while(@z){@a=split(shift@z,crypt(shift@y,pop@y));@g=split(pop@z, +$a[1]);print $g[0]}
This One's a Sieve
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by Schmunzie
on Mar 31, 2015 at 11:17
    hdb recently pointed out that I had misremembered how the Sieve of Eratosthenes works so now I'm having another go. Not all that obfu'd but moderately golfed.


What Perl Will Tell
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by martin
on Mar 20, 2015 at 00:05
    This one may be somewhat system-dependent but worked with quite different flavours of Perl. I expect it will be difficult to predict without actually using a perl binary. Have fun!
    eval'[]->Jk',$^X=~m;(?:.*[\\/])?([^\W\d]+);;$==ord('?'^':'),$,=q** ,*_=[map+chr,$[..$=<<$=],*_={map{;$_,++$=}grep/(?=\W)[$"-~]/,@_},* _=sub{map{join$,,@_[@_{split$,,$_}]}+$,."->]'","!?;'(&}","(! .\\}" },*_=[_(split$,,$@),"\u$1"],*_=\"@_[$[,!!!$[,-!$[,$#_^!$[],",print
Are old obfus gone forever?
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by Schmunzie
on Mar 19, 2015 at 20:39
    Years ago, with a previous account (no idea of my name then) I posted an obfu of which I was immensely proud. The code was in the shape of an ornate grand-father clock, complete with pendulum and the output was the current time (to the nearest 12 mins) on an ASCII analogue clock face.

    I would love to see it again.

Not a Sieve
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by Schmunzie
on Mar 16, 2015 at 06:51
    $i++;while(@p<50){$i++;&d;print"$i,"x!$x}sub d{for(@p){if($x=(!($i%$_))){return}}push@p,$i}
An obfu for Pi Day
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by Schmunzie
on Mar 14, 2015 at 09:24
    $e=$k=$f=$a=$m=$n=1;@y=split//,"mpqeyn";$y=$p=$a+$m+$n;push@mn,pop@y;u +nshift@mn,shift@y;while($#p<14){$a++;@b=@p;&d}while($f>2**-$p[$#p]){$ +i+=2;$r=$i%4;$f=4/($i*($i+1)*($i+2));$p+=$f*($r-1);if($i/2<$p[$p[4]]) +{eval"\$$mn[$r/2]+=\$$mn[!$r]";$y=$y/2+1/$y;eval"\$q=\$$mn[$r/2]/\$$m +n[!$r]";$k*=($i/2);$e+=1/$k}}for$o(@y){print"<br>$$o"}sub d{while(@b) +{$x=!($a%shift@b);if($x){return}}push@p,$a;print"$a,"}
First Japh
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by Discipulus
on Feb 06, 2015 at 07:15
    Not sure if can be considered an obfu..
    unx#perl -e '@_="Js nte elHce rka rPrhoAtu"=~/./g;for$}(1..$#_+1){whil +e(<$0 >){(s|e|($}%2?shift@_:pop@_)|e);print}}' win>perl -e "@_='Js nte elHce rka rPrhoAtu'=~/./g;for$}(1..$#_+1){whil +e(<$0 >){(s|e|($}%2?shift@_:pop@_)|e);print}}"

    There are no rules, there are no thumbs..
    Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.
Late PM, 12/24/2014 & all year long
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by ww
on Dec 24, 2014 at 23:00
    perl -e "srand 42; print sort {4-rand 9} split //, 'ts aroMrhirsae C tll!!ym';"

    Adapted from Re^2: Slightly Srandom JAPH; Update: now known to be highly OS and version specific, but "Season's Greetings" anyway!
    *1 : Alt date format: 20141224. This node, however, is known to be ISO 2000 non-compliant.
    *3Notes placed in sig & then reordered for comppliance with obfuscation.
    *2 : Original OS/vers.: AS 5.018 & Win7.

Code golfing site - SHORTEN
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by kokosek
on Nov 30, 2014 at 21:09

    Hello. I'm the admin of A site, in which you can submit your Perl programs and they will be compiled and run with problem's data.

    I have a user there who is especially good in Perl and he has the best score (= shortest programs) in most problems. So I was thinking that perhaps some of you would like to give it a try and challenge him. I'm wondering whether anybody can beat him in any task.

    Here's a ranking for Perl (as you can also submit on SHORTEN programs in other languages):
    As you can see, his score is 9.93/10.

    To encourage you, printing n-th Fibonacci number takes in Perl only 43 chars (assuming t tests) - it's FIBON problem on SHORTEN if you wondered.

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