The Bash if statement is a fundamental construct that allows you to control the flow of your scripts based on specific conditions. By leveraging conditionals, such as numeric and string comparisons, and file and
if [ expression ]; then statements elif [ expression ]; then statements else statements fi the elif (else if) and else sections are optional Put spaces after [ and before ], and around the operators and operands. Expressions An expression can be: String comparison, Numeric comparison, File ...
if [ -z "$string2"] then echo "Empty String" fi Bonus Tip: Single bracket ‘[]’ and double bracket ‘[[]]’ in bash scripts You can also use the if statement with double brackets like this: if [[ "$string1" == "My String" ]] The single bracket is the oldPosixconvention and...
TheBash case statementis a form of theif elif else conditionalstatement, simplifying complex conditions and offering multiple choices. When using the case statement, there is no need to specify the test operators for comparing strings. However, the statement only matches the string against specified ...
'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
Now that you are aware of the various comparison expressions let's see them in action in various examples. Use if statement in bash Let's create a script that tells you if a given number is even or not. Here's my script namedeven.sh: ...
String is empty. Copy #!/bin/bash VAR='Linuxize' if [[ -n $VAR ]]; then echo "String is not empty." fi Copy String is not empty. Copy Comparing Strings with the Case Operator Instead of using the test operators you can also use the case statement to compare strings:...
How to check if a command succeeds or failed? How to do string comparison and check if a string equals to a value? How to check if a string is in an array? How to use the Bash ternary operator? How to negate an if condition in a Bash if statement? (if not command or if not ...
if [ $num -lt 1 ]; then It is the arithmetic or number-based conditions, and this statement allows comparison of integer numbers. This condition is counted as true only if the entered number is less than 1. if [[ “$stringvar” == *string* ]]; then It is the double-bracket sy...
Note:Learn how to compare strings using a Bash script with our guideBash string comparison. Conclusion This guide showed how to use the Bashcasestatement to simplify complex conditionals when working with multiple choices. Create different scripts to test patterns and process a command if a match ...