|Yes, you really can learn Unix/Linux shell scripting in 24 hours. And, what works for the traditional Unix Bourne shell also works for the GNU Bourne Again SHell, bash, the virtual standard for Linux.|
One of the most powerful standard programs available in UNIX is the shell. The shell is a program that provides you with a consistent and easy-to-use environment for executing programs in UNIX. If you have ever used a UNIX system, you have interacted with the shell.
The main responsibility of the shell is to read the commands you type and then ask the UNIX kernel to perform these commands. In addition to this, the shell provides sophisticated programming constructs that enable you to make decisions, repeatedly execute commands, create functions, and store values in variables.
This book concentrates on the standard UNIX shell called the Bourne shell.