Using Bash sequence expression you can generates a range of integers or characters by providing the start and the end point of the range. In this guide, we will show you the basics of the sequence expression in Bash. Bash Sequence Expression# Below is the basic form of the sequence expression: {START..END[..INCREMENT]} The expression...
At the time of writing bash scripts, it’s often required to compare two strings to check it wether those are equal or not. Two strings are equal when they have the same length and contain the same sequence of characters. This guide shows you how to compare strings in Bash. Comparison Operators# Comparison operators...
The bash case statement can be used when you have multiple choices conditions. Using bash case statement, it will be more readable and easier to maintain instead of nested if statements. This tutorial shows you the basics and use of the Bash case statement in shell scripts. The Bash case statement has a similar...
In Linux, the echo command is most common and frequently used command. It will print the passed arguments to the standard output. Generally, echo command is used in shell scripts to show a message or output the results of other commands. echo Command# By default, the echo is built-in in Bash and other shells...
Loop is the basic requirement of any programming languages. Loops are useful when you want to execute a series of commands until the certain condition is satisfied. In Bash, loops are useful for automating repetitive tasks. In this tutorial, we will see basics of for loop in Bash. There are three basic loop constructs,...
The if statement is the most basic concepts of any programming language. In Bash, you can also use if…else, if…elif.else and nested if statements like other programming languages. In this article, we will show you the basics of the Bash if statement and use of it in your shell scripts. if Statement# If statement...
In this article, we will discuss about the Bash exit built-in command and the exit code of the executed commands. Generally, at the time of writing Bash scripts, you will need to terminate the script when a certain condition is met or to take action based on the exit code of a command. Exit...
The source is a shell built-in command which is used to read and execute the content of a file, passed as an argument in the current shell script. It is useful to load functions, variables, and configuration files into shell scripts. Source Command Syntax# The following is the basic syntax for the Source Command:...
This tutorial explains how to append text to a file in Bash. There are different ways to append text to a file. Prerequisite# Your user must have write permission to a file in which you want to append text. Otherwise, you will receive a permission denied error. Append Text using Redirection Operator (>>)# Using...
While working with Bash and shell scripts, you might need to check whether a directory or a file exists or not on your filesystem. In order to check whether a file or a directory exists with Bash, you can use test command. Following is the basic syntax for the test command: Check If File...