3/13    How do you change the logging behaviour of sudo after it has
        been installed?  (i want to log all actions taken as sudo).

#!/usr/bin/perl -w
# 531-byte qrpff-fast, Keith Winstein and Marc Horowitz
<sipb-iap-dvd@mit.edu>
# MPEG 2 PS VOB file on stdin -> descrambled output on stdout
# arguments: title key bytes in least to most-significant order
$_='while(read+STDIN,$_,2048){$a=29;$b=73;$c=142;$t=255;@t=map{$_%16or$t^=$c^=(
$m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;$t^=(72,@z=(64,72,$a^=12*($_%16
-2?0:$m&17)),$b^=$_%64?12:0,@z)[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h
=5;$_=unxb24,join"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$
d=unxV,xb25,$_;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=$t&($d>>12^$d>>4^
$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*8^$q<<6))<<9,$_=$t[$_]^
(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}print+x"C*",@a}';s/x/pack+/g;eval
        \_ So, what's the purpose of using "eval" here? -perl newbie
           \_ RTFM. most single-arg perl commands take $_ as the default arg
              if they're not given one. so eval at the end evals everything else,
              which is stored in $_.
                \_ I know what eval and $_ stand for. I did not ask this
                   correctly I guess. I am wondering what's the purpose of
                   doing this fancy '$_=".."; eval' stuff? Looks like
                   redundant to me.
                   \_ (1) obfuscation; (2) compression by being able to use "x"
                      instead of "pack+", which occurs frequently in the actual
                      executed code (i.e. note the s/x/pack+/g). -alexf
                   \_ just being clever about it.  It isn't strictly required
                      but it sure looks cool.