It is found that in any Linux/Unix based Operating Systems it is good to understand fork and vfork system calls, how they behave, how we can use them and differences between them. Along with...
Function is a reusable block of code. Often we put repeated code in a function and call that function from various places. Library is a collection of functions. We can define commonly used function...
In this tutorial on Bash scripting, we are going to learn to do comparisons. We will be discussing numeric, strings & file comparisons in a Bash script. Comparisons in a script are very useful...
Overview : Command line arguments (also known as positional parameters) are the arguments specified at the command prompt with a command or script to be executed. The locations at the command prompt of the...
In most of the programming languages debugger tool is available for debugging. A debugger is a tool that can run a program or script that enables you to examine the internals of the script...
Q:1 What is Shell Script and why it is required ? Ans: A Shell Script is a text file that contains one or more commands. As a system administrator we often need to issue...
Every process in Linux is provided with three open files( usually called file descriptor). These files are the standard input, output and error files. By default : Standard Input is the keyboard, abstracted as...
In Bourne Shell if statement checks whether a condition is true or not. If so , the shell executes the block of code associated with the if statement. If the statement is not true...
In every programming language variables plays an important role , in Linux shell scripting we are using two types of variables : System Defined Variables & User Defined Variables. A variable in a shell...
What is a Shell A shell is an interpreter in UNIX like Operating system. It takes commands typed by the user and calls the operating system to run those commands. In simple terms a...
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