Bash if… else Statement

1. How do you write an IF ELSE statement in bash?
2. What is else if in bash?
3. Can you put IF statement in if statement?
4. How does Elif work in bash?
5. What is $? In Bash?
6. How do I get input in bash?
7. How do you increment in bash?
8. What is difference between if-else Fi and if Elif else Fi statement?
9. What is exit in bash?
10. What are the 3 arguments of the IF function?
11. What kind of statement is the if statement?
12. What happens if you put a semicolon after an if statement?

How do you write an IF ELSE statement in bash?

In order to execute a Bash “if else” statement, you have to use four different keywords : if, then, else and fi :

1. if : represents the condition that you want to check;
2. then : if the previous condition is true, then execute a specific command;
3. else : if the previous condition is false, then execute another command;

What is else if in bash?

The elif (else if) is used for multiple if conditions. In case if the first condition goes false then check another “if” conditions. In the following example, we are taking input from the user and display corresponding statements. Use “if” condition to check if the marks are greater or equal to 80.

Can you put IF statement in if statement?

You can put an if statement inside another if statement.

How does Elif work in bash?

The elif (else if) is used for multiple if conditions. In case one if the condition goes false then check another if conditions. For example, input the marks of a student and check if marks are greater or equal to 80 then print “Very Good”. If marks are less than 80 and greater or equal to 50 then print 50 and so on.

What is $? In Bash?

$? is a special variable in bash that always holds the return/exit code of the last executed command. You can view it in a terminal by running echo $? . Return codes are in the range [0; 255]. A return code of 0 usually means everything is ok.

How do I get input in bash?

Example 1:

1. #!/bin/bash.
2. # Read the user input.
3. echo "Enter the user name: "
4. read first_name.
5. echo "The Current User Name is $first_name"
6. echo.
7. echo "Enter other users'names: "
8. read name1 name2 name3.

How do you increment in bash?

Using + and - Operators

The most simple way to increment/decrement a variable is by using the + and - operators. This method allows you increment/decrement the variable by any value you want.

What is difference between if-else Fi and if Elif else Fi statement?

If specified condition is not true in if part then else part will be execute. To use multiple conditions in one if-else block, then elif keyword is used in shell. If expression1 is true then it executes statement 1 and 2, and this process continues. If none of the condition is true then it processes else part.

What is exit in bash?

Bash provides a command to exit a script if errors occur, the exit command. The argument N (exit status) can be passed to the exit command to indicate if a script is executed successfully (N = 0) or unsuccessfully (N != 0). If N is omitted the exit command takes the exit status of the last command executed.

What are the 3 arguments of the IF function?

The IF function is pretty simple, and contains the following three arguments.

• Logical Test.
• Value If True.
• Value If False (optional)

What kind of statement is the if statement?

What kind of statement is the IF statement? Explanation: IF statement is a sequential statement which appears inside a process, function or subprogram. This statement is used to execute some block of statements if a condition executed comes to be true.

What happens if you put a semicolon after an if statement?

Semicolon at end of 'if' statement. Which basically means that the stuff will be done whether a equals b or not, and the if statement has no point whatsoever.