The structure below illustrates the basic syntax for nested ‘bash if else’ statements. Here, the outerif [[ conditions ]]clause encompasses code executable only upon condition fulfillment. In our context, the nested code is another ‘if’ statement. if [[ conditions ]]– This represents the ...
Example-2: if statement with multiple conditions How you can apply two conditions with logical AND in ‘if’ statement is shown in this example. Create a file named ‘cond2.sh’ and add the following script. Here,usernameandpasswordwill be taken from the user. Next, ‘if’ statement is u...
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...
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,...
在bash 脚本中用于做出决定的最常见和基本的条件语句是“if”语句。这主要在需要检查某个条件是否满足时使用。在 bash 中使用 if 语句的语法是: if [[ <condition> ]] then <statement> fi 在上面的语法中,只有满足<条件>时才会执行<语句>。例如,如果您需要在检查用户输入值是否小于 10 后在控制台上打印一...
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". ...
statement can be used to check the different conditions in Bash. The different types of comparison operators, logical operators, and options are used with the “if” statement for testing. The uses of the “-z” and “-n” option to test the string values using the “if” statement in ...
There are also conditions for file type check: ConditionEquivalent to true when -f $a $a is a file -d $a $a is a directory -L $a $a is a link Now that you are aware of the various comparison expressions let's see them in action in various examples. Use if statement in bash ...
elif [[ conditions ]] then code else code fi Code explanation: The keywords"if"and"fi"mark the start and end of the conditional statement. Every if statement should be followed by the"then"keyword. Either[[ ]]or[ ]should be used to evaluate the condition. If the condition is evaluated...
/bin/bashecho"Enter your marks out of 100: "readmarksif[$marks-gt 100];thenprintf"You have entered incorrect marks:$marks\n "fi Output: Use theifStatement With Multiple Conditions In the previous example, we used a single condition. We can also apply multiple conditions and separate them ...