Language: Unix shell


Author:Brian A.E. Meekings (baem@mink.mt.att.com)
Note: sh, ksh

b=\\;bb=$b$b$b$b;q=\';x='echo "b=$bb;bb=\$b\$b\$b\$b;q=$b$q;x=$q$x$q";echo $x'
echo "b=$bb;bb=\$b\$b\$b\$b;q=$b$q;x=$q$x$q";echo $x


Author: Matt Corks, njaharve@waterloo.ca
Note: works for bash, ksh, zsh

#!/xhbin/bash
read foo<<'EOF';eval $foo
echo '#!/bin/bash';echo 'read foo<<'"'EOF'"';eval $foo';echo $foo;echo EOF
EOF


Author: Luca Caucci

#!/bin/sh
#Questo shell script visualizza il suo codice.
#Autore: Luca Caucci (e-mail: caucci@cs.unibo.it)
IFS=;A="\n";B="'";C='\\'
D='#!/bin/sh%b#Questo shell script visualizza il suo codice.%b#Autore: Luca Caucci (e-mail: caucci@cs.unibo.it)%bIFS=;A="%bn";B="%b";C=%b%b%b%b%bD=%b%b%b%bprintf $D $A $A $A $C $B $B $C $C $B $A $B $D $B $A $A $A%b%b'
printf $D $A $A $A $C $B $B $C $C $B $A $B $D $B $A $A $A


Author: Mark Wooding

#! /bin/sh
q="'" qq='echo \#! /bin/sh;echo q=\"$q\" qq=${q}$qq$q;echo eval \$qq'
eval $qq


Author: Pekka P. Pirinen (pekka@harlequin.co.uk)

#! /bin/csh
(set foo=$<; eval $foo)<<'EOF'
echo '#! /bin/csh'; echo '(set foo=$<; eval $foo)<<'"'EOF'"; echo $foo; echo "'EOF'"
'EOF'

Author: Daniel Martin

#!/bin/sh
#This is a self-replicating shell script
a="#!/bin/sh
#This is a self-replicating shell script
a=";
b=\'
c='cat <<EOD
${a}"$a";
b=\\$b
c=$b$c$b
$c
EOD'
cat <<EOD
${a}"$a";
b=\\$b
c=$b$c$b
$c
EOD



Author: Andru Luvisi

q(){ d=\';s='echo "q(){ d=\\$d;s=$d$s$d;eval \"\$s\";}"';eval "$s";}

Author: Bruce Ediger (ediger@rtgds1.den.mmc.com)

st='echo st=$sq${st}$sq;echo dq=$sq${dq}$sq;echo sq=$dq${sq}$dq;echo $st'
dq='"'
sq="'"

echo st=$sq${st}$sq;echo dq=$sq${dq}$sq;echo sq=$dq${sq}$dq;echo $st 


Author: Bruce Ediger (ediger@rtgds1.den.mmc.com)  
Note: requires a filename from the command line

st='echo st=$sq${st}$sq > $1;echo dq=$sq${dq}$sq >> $1; echo sq=$dq${sq}$dq >> $1;echo
$st >> $1; chmod +x $1' dq='"' 
sq="'" 
echo st=$sq${st}$sq > $1;echo dq=$sq${dq}$sq >> $1;\ echo sq=$dq${sq}$dq >> $1;echo $st
>> $1; chmod +x $1 


Author: Bruce Ediger (ediger@rtgds1.den.mmc.com)
Note requires a filename

st='echo st=$sq${st}$sq > $1.1;echo dq=$sq${dq}$sq >> $1.1; 

echo sq=$dq${sq}$dq >> $1.1;echo $st >> $1.1; chmod +x $1.1;
echo st=$sq${st}$sq > $1.2;echo dq=$sq${dq}$sq >> $1.2;
echo sq=$dq${sq}$dq >> $1.2;echo $st >> $1.2; chmod +x $1.2'

dq='"' 
sq="'" 

echo st=$sq${st}$sq > $1.1;echo dq=$sq${dq}$sq >> $1.1;
echo sq=$dq${sq}$dq >> $1.1;echo $st >> $1.1; chmod +x $1.1;
echo st=$sq${st}$sq > $1.2;echo dq=$sq${dq}$sq >> $1.2;
echo sq=$dq${sq}$dq >> $1.2;echo $st >> $1.2; chmod +x $1.2



Author: Bruce Ediger (ediger@rtgds1.den.mmc.com)
Note: I hesitate to include this one.  Do NOT run it, as it will fill up your HD
with ease.  

a='echo a=$c${a}$c > $$;echo b=$c${b}$c >> $$;echo c=$b${c}$b >> $$; echo $a >> $$;
chmod +x $$; ./$$' 
b='"' 
c="'" 
echo a=$c${a}$c > $$;echo b=$c${b}$c >> $$; echo c=$b${c}$b >> $$;echo $a >> $$; chmod
+x $$; ./$$ 


Author: Bruce Ediger (ediger@rtgds1.den.mmc.com)

st='echo st=$sq${st}$sq > $0.1;echo dq=$sq${dq}$sq >> $0.1; 

echo sq=$dq${sq}$dq >> $0.1;echo $st >> $0.1; chmod +x $0.1;
echo st=$sq${st}$sq > $0.2;echo dq=$sq${dq}$sq >> $0.2;
echo sq=$dq${sq}$dq >> $0.2;echo $st >> $0.2; chmod +x $0.2'

dq='"' 
sq="'" 

echo st=$sq${st}$sq > $0.1;echo dq=$sq${dq}$sq >> $0.1;
echo sq=$dq${sq}$dq >> $0.1;echo $st >> $0.1; chmod +x $0.1;
echo st=$sq${st}$sq > $0.2;echo dq=$sq${dq}$sq >> $0.2;
echo sq=$dq${sq}$dq >> $0.2;echo $st >> $0.2; chmod +x $0.2



Author: Eli Biham
Notes: A cheat

#!/bin/csh
cat $0 

Author:Ralf Draeger (Ralf.Draeger@Intraplan.de)
Note: the most novel cheat I've seen.  Requires Slowlaris 2.5.1

#!/bin/ksh
gcore $$ 2>/dev/null
echo "#!/bin/ksh"
sed -n '/^gcore/,/^\#The end/p' core.$$ 
#The end