In bash script, if you wish to apply multiple conditions using if statement then use ‘ if elif else’. In this type of conditional statement, if the first condition is met then code below it will be executed otherwise next if condition will checked and if it is not matched then commands...
The methods of using conditional logic in Bash through the different types of “if” and “case” statements to compare the string and numeric values, checking the variable content, checking the existence of the file or directory, etc. are shown in this tutorial. List of Content: Use of ...
Go to topUse of the “For” Loop with the Break StatementThe “break” statement is used inside a loop to terminate from the loop based on the particular condition. Two command-line argument values are checked before starting the execution of the infinite “for” loop. If the argument ...
We are going to stop here. We are stopped!!! Break Out of the for Loop in BashThe keyword break also can be used to stop the for loop at a specific condition. To do this, see the below example:for i in {1..15} do if [[ $i == '5' ]] then echo "Number $i! We are...
However, there are potential pitfalls. If you’re not careful, you might run into issues with whitespace in your array elements, as Bash will split on whitespace by default. To avoid this, always remember to quote your array expansion, like so:"${array[@]}". ...
For example, let’s say that you want to check if the file “/etc/passwd” exists on your filesystem or not. In a script, you would write the following if statement. #!/bin/bash if [[ -f "/etc/passwd" ]] then echo "This file exists on your filesystem." ...
To understand if-else in shell scripts, we need to break down the working of the conditional function. Let us have a look at the syntax of the if-else condition block. if [condition] then statement1 else statement2 fi Copy Here we have four keywords, namely if, then, else and fi....
You can have awhileloop to keep checking for that directory's existence and only write a message while the directory does not exist. If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: ...
for((initialization;condition;increment/decrement))doShell command[s]done Example: Assume we want to write a script that may help us print a table of any user-provided number. We can do that using the following code. #!/bin/bashecho"Enter a Number: "readnumberfor((j=1;j<=10;j++))...
The most common logic errors in a shell script include: Incorrect use of a test operator in a Conditional Statement like using -z instead of -n in a if condition Incorrect use of an Arithmetic operator like multiplying instead of diving a number Incorrect condition to exit from a Bash Loop...