Rasande: Linux Bash If Else Example

Linux Bash If Else Example

The use of else if condition is little different in bash than other programming language. If statement and else statement could be nested in bash.

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Lets take another example of a bank account program in which we want to have three separate outputs for 3 different situations.

Linux bash if else example. Using else if statement. If structures to execute code based on a condition home nested ifs ifelsefi allows to make choice based on the success or failure of a command. The usage statement is a string defining how the shell script should be invoked.

The balance is zero. If then else statement. The balance is less than zero.

The if statement expression expects exactly 2 arguments no more and no less. Bash if statements are very useful. In the ifthenelse form of the if statement the block of statements after the then statement is executed if the condition succeeds.

The balance is above zero. If statements and closely related case statements allow us to make decisions in our bash scripts. If the expression is false then no statement will be executed.

For instance in the following program use the if elif else statements to display different outputs in different scenarios. The shell can accommodate this with the ifthenelse syntax. If expression then statements to be executed if expression is true else statements to be executed if expression is not true fi the shell expression is evaluated in the above syntax.

How to use if else else if elif and fi conditional statements in bash shell scripting bash programming with useful examples. For example find out if file exists true condition or not false condition and take action based on a condition result. Elif is used to define else if condition in bash.

It makes use of basename utility which will remove the directory path and suffix from filenames. How to use if else else if elif and fi conditional statements in bash shell scripting bash programming with useful examples. The keyword fi indicates the end of the inner if statement and all if statement should end with the keyword fi.

Else and else if in bash shell scripting written by rahul updated on may 10. In this example we will check for certain age ranges. They allow us to decide whether or not to run a piece of code based upon conditions that we may set.

In a conditional you frequently have tasks to perform when the tested condition succeeds or fails. Key takeaways from example 2s sample script. Create a file named elseifexamplesh and add the following script to check how else if is defined in bash script.

If the resulting value is true given statements are executed. If you are between 20 and 30 you are in your 20s and so on. In this section of our bash scripting tutorial you will learn the ways you may use if statements in your bash scripts to help automate tasks.

If you are less than 20 or greater than 50 you are out of the age range. The if then elif then else fi example mentioned in above can be converted to the nested if as shown below.

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