The syntax for arithmetic operations in the bash shell is this: $((arithmetic_operation)) Let's say you have to calculate the sum of two variables. You do it like this: sum=$(($num1 + $num2)) There is no restri
Single quotes in bash will suppress special meaning of every meta characters. Therefore meta characters will be read literally. It is not possible to use another single quote within two single quotes not even if the single quote is escaped by backslash. #!/bin/bash #Declare bash string variab...
terminated by one of the shell’s control operators (see Chapter 2 [Definitions], page 3). The first word generally specifies a command to be executed, with the rest of the words being that command’s arguments.
Most of the time when you’re writing bash scripts you won’t be comparing two raw values or trying to find something out about one raw value, instead you’ll want to create a logical statement about a value contained in a variable. Variables behave just like raw values in logical express...
You can modify the default behavior of thehistorycommand by setting environment variables, which we'll review in more detail shortly. #Working with Bash history: the basics Bash history is a feature that allows you to view and clear previously executed commands. Below, we’ll go through how ...
.bashrc - shell tuning and sourcing of .bash.d/*.sh .bash.d/*.sh - thousands of lines of advanced bashrc code, aliases, functions and environment variables for: Linux & Mac SCM - Git, Mercurial, Svn AWS GCP Docker Kubernetes Kafka Vagrant automatic GPG and SSH agent handling for handl...
Theawk commandacts as a selector for pattern expressions. For example, to perform addition using theawkcommand, use the following example statement: awk 'BEGIN { x = 2; y = 3; print "x + y = "(x+y) }'Copy For variablesx = 2andy = 3, the output printsx + y = 5to the cons...
While Bash is a powerful and popular shell, it’s not the only one available. There are several other shells in the Linux ecosystem that offer unique features and capabilities. Let’s explore two popular alternatives: Zsh and Fish. Zsh: A Robust Bash Alternative ...
@@ -90,7 +90,7 @@ You can also add variables in the Command Line outside the Bash script and they ```bash ./devdojo.sh Bobby buddy! ``` This script takes in two parameters `Bobby`and `buddy!` seperated by space. In the `devdojo.sh` file we have the following: Thi...
echoEnter value of x: readx echoEnter the value of y: ready #Addition ans=$((x+y)) echoThe Sum of two variables is:$ans #Subtraction ans=$((x-y)) echoThe Difference of two variables is:$ans #Multiplication ans=$((x*y)) ...