Converting Bash script to Binary code

Bash Shell basically comprises of commands written in C language. Hence we basically need a Compiler that can convert the C code into executable Binary file.  I guess there are many C compilers available;  the one which I use is SHC (SHell script Compiler).  When we compile using this tool, it creates an execute file with .x extension, which is basically a executable version of your Bash script which can’t be readable or modifiable.

URL to download the tool :  http://dl.dropbox.com/u/50666315/blog/shc-3.8.7.tgz

Illustration:

Extract the shc tar file.
Go into the shc-3.8.7 folder
Install the package by executing 'make'. It will create the 'shc' executable.

Create a sample bash script "sample.sh".

[root@host01 opt]$ cat sample.sh

#!/bin/bash

echo "Hello how r u"

echo

[root@host01 opt]$

[root@host01 opt]# ./sample.sh                              #  Take a note on output

Hello how r u

[root@host01 opt]#

[root@host01 shc-3.8.7]$ ./shc -f /opt/sample.sh

[root@host01 opt]# ls -l sample.sh*

-rwxr-xr-x 1 root root    39 Sep 13 12:11 sample.sh

-rwx--x--x 1 root root 11720 Sep 13 12:12 sample.sh.x     #  .x file created

-rw-r--r-- 1 root root  9406 Sep 13 12:12 sample.sh.x.c

[root@host01 opt]#

[root@host01 opt]# ./sample.sh.x                                #  Same result as before

Hello how r u

[root@host01 opt]# tail sample.sh.x                            #  File is in Binary format

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