I have following read me of password cracking software:--

Installing John the Ripper
============================

Compiling the Sources
-----------------------

Compile the sources with:

cd src
make

You'll get a list of supported systems. Select one of them, and type:

make SYSTEM

or, if your system is not listed, try:

make generic

If everything goes well, this will create the John binary in run/john.

You can then copy the run directory anywhere you like: these are all thefiles that John needs at runtime.

Installing from a Binary Distribution
---------------------------------------

You might need to take run/{john.ini,*.chr,password.lst} from the source
distribution for things to work, unless these files are present already.

Note on Moving Binaries between Systems
-----------------------------------------

On some architectures, a few hardware performance parameters are detected
at compile time -- in particular, this is done for SPARC and generic make
targets. If you then move the binary to a different system, you might not
get the best performance. It is better to re-compile John on each system,
where possible.


When i tried , it gives me following error ???

[root@akshar src]# make generic
rm -f arch.h
gcc -c -Wall -O2 -fomit-frame-pointer detect.c
gcc -s detect.o -o detect
./best.sh "make" \
"DES_fmt.o DES_std.o" \
"MD5_std.o" \
"BF_std.o"

/bin/sh: ./best.sh: /bin/sh: bad interpreter: Permission denied
make: *** [generic.h] Error 126

Try open up the best.sh script and change the first line from: to...Håkan

After changing /bin/sh to /bin/bash error is present:-


[root@akshar src]# make generic
rm -f arch.h
gcc -c -Wall -O2 -fomit-frame-pointer detect.c
gcc -s detect.o -o detect
./best.sh "make" \
"DES_fmt.o DES_std.o" \
"MD5_std.o" \
"BF_std.o"
/bin/sh: ./best.sh: /bin/bash: bad interpreter: Permission denied
make: *** [generic.h] Error 126
[root@akshar src]# vi best.sh