Compiling and installing your own Bash shell

In this recipe, we are going to learn about compile and install the Bash shell. We are going to use SHC, which is shell script compiler.

 

Getting ready

Besides having a terminal open, make sure you have SHC installed in your system.

How to do it...

Now we will write a simple shell script that will print “Hello World”. Using SHC, the Shell script will be converted into binaries directly. Create a script hello.sh, and write the following content in it.

#!/bin/bash
echo "Hello World"
a=10
b=20
c=$((a+b))
echo $c

Now, to log all commands, run the logger command as follows:

$ logger -f hello.sh

How it works...

After executing the script, two extra files will be created. The files are:

• hello.sh.x: This file is the stripped binary encrypted shell script in binary format
• hello.sh.x.c: This file is the C source code of hello.sh

Now, execute the encrypted shell script as follows:

$ ./hello.sh.x

The logger command will make an entry about your file in the syslog file...