Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
1. Bash If..then..fi statement if [ conditional expression ] then statement1 statement2 . fi This if statement is also called as simple if statement. If the given conditional expression is true, it enters and executes the statements enclosed between the keywords “then” and “fi”. If th...
if [ condition-statement ]; then Commands.. fi 让我们看一个使用 if 条件的示例 bash 脚本。 脚本: #!/bin/bash echo "Enter your marks out of 100: " read marks if [ $marks -gt 100 ]; then printf "You have entered incorrect marks: $marks\n " fi 输出: 使用带有多个条件的 if 语...
Using a Bash If Statement with Conditional Expressions Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the Binary Operator Expected Error? Why you should not use the || and && ...
'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
Example 3: If statement in bash on less than a number In addition to-eqfor equality you can also try-lt -le -gt -getest conditions for less than, less than or equal, greater than or greater then or equal respectively. Below is a similar example with less then operator-lt: ...
There are also conditions for file type check: Now that you are aware of the various comparison expressions let's see them in action in various examples. Use if statement in bash Let's create a script that tells you if a given number is even or not. ...
4. Nested if Statement Bash allows using any number of if statements inside an if statement, that means we can use a nested if statement to test multiple conditions. It is helpful when we have to check multiple conditions inside an if statement. The general syntax of this statement is: ...
/bin/zshecho"Enter a number: "readnumberif[$number-gt0];thenecho"The number is positive."elif[$number-lt0];thenecho"The number is negative."elseecho"The number is zero."fi chmod +x example.sh Case The case statement is used to execute commands based on multiple conditions....
An if statement checks if the age is greater than or equal to 18. The condition [ "$age" -ge 18 ] checks if the value of '$age' is greater than or equal to 18. If the condition evaluates to true, the script prints "You are an adult" using "echo". ...