Introduction Understand Linux Shell and Basic Shell Scripting Tips – Part I [ad_1] The Linux shell, or command-line interface, is a powerful program that enables users to interact with the operating system via text-based commands. Understanding the basics of the Linux shell and shell scripting can greatly enhance your efficiency and control over your system. … Read more
Introduction 10 Useful Chaining Operators in Linux with Practical Examples [ad_1] Chaining of Linux commands means, combining several commands and making them execute based upon the behavior of the operator used in between them. Chaining of commands in Linux is something like you are writing short shell scripts at the shell itself, and executing them … Read more
You can assign the output of a shell command to a variable in a bash shell script by using the following syntax: VARIABLE_NAME=$(command) For example, to assign the output of the ls command to a variable called FILES, you would use the following syntax: FILES=$(ls) [ad_1] One of the fundamental features of a shell script … Read more
1. Use the concatenation operator (+): var1=”Hello” var2=”World” echo $var1+$var2 2. Use the double quotes: var1=”Hello” var2=”World” echo “$var1 $var2″ 3. Use the append operator (.): var1=”Hello” var2=”World” echo $var1.$var2 [ad_1] String concatenation is the process of combining two or more strings to form a single string. In this tutorial, you will learn how to … Read more
You can use the -v operator to check if a variable is set in Bash. For example: if [ -v VARIABLE_NAME ]; then echo “Variable is set” else echo “Variable is not set” fi [ad_1] When working with Bash scripts, it’s important to check if a variable is set before performing any operations on it. … Read more
You can use the command line utility “which” to check if a program exists from a Bash script. For example, to check if the program “foo” exists, you can use the following command: which foo If the program exists, the output will be the full path to the program. If the program does not exist, … Read more
To split a string by a delimiter and get the n-th element, use the following syntax: ${string//delimiter/n} For example, to split a string by a comma and get the third element, use the following syntax: ${string//,/3} [ad_1] To bash shell scripting is to split strings by delimiter and extract a specific element from it. In … Read more
You can use the “test” command to check if a file does not exist in Bash. The syntax is as follows: test ! -f For example, to check if the file “example.txt” does not exist, you would use the following command: test ! -f example.txt [ad_1] Checking if a file exists or not in bash … Read more
1. Using awk: awk -F “,” ‘{print $1, $2, $NF}’
To split a string on a delimiter in Bash, you can use the built-in command IFS (Internal Field Separator). For example, to split a string on a comma, you can use the following command: IFS=”,” read -ra arr
You can use the Bash built-in command [[ to check if a string contains a substring. For example, to check if the string “Hello World” contains the substring “World”, you can use the following command: [[ “Hello World” == *”World”* ]] && echo “String contains substring” This will output “String contains substring” if the string … Read more
To check if a directory exists in Bash shell script, you can use the following syntax: if [ -d “/path/to/dir” ]; then echo “Directory exists” else echo “Directory does not exist” fi [ad_1] When writing shell scripts, it is often necessary to check if a directory exists before performing certain actions. Checking if a directory … Read more