How to use the Bash case statement

1. Each case statement starts with the case keyword, followed by the case expression and the in keyword. ...
2. You can use multiple patterns separated by the | operator. ...
3. A pattern can have special characters .
4. A pattern and its associated commands are known as a clause.
5. Each clause must be terminated with ;; .

1. How does case work in bash?
2. What is case command in bash?
3. How do you write a case statement in shell script?
4. What is the use of #!/ Bin bash?
5. How do you write a case in bash?
6. How do you set a variable in bash?
7. How do you increment in bash?
8. How do you do if else in bash?
9. What is exit in bash?
10. What is case command?
11. What is CASE statement in Linux?
12. Which statement is used to close a case construct?

How does case work in bash?

Bash shell case statement is similar to switch statement in C. It can be used to test simple values like integers and characters. Case statement is not a loop, it doesn't execute a block of code for n number of times. Instead, bash shell checks the condition, and controls the flow of the program.

What is case command in bash?

Bash case command is used to take proper action by comparing data like if statement. It works like a switch-case statement of other standard programming languages. This command starts with 'case' statement and closes by 'esac' statement.

How do you write a case statement in shell script?

The basic syntax of the case... esac statement is to give an expression to evaluate and to execute several different statements based on the value of the expression. The interpreter checks each case against the value of the expression until a match is found. If nothing matches, a default condition will be used.

What is the use of #!/ Bin bash?

/bin/bash is the most common shell used as default shell for user login of the linux system. The shell's name is an acronym for Bourne-again shell. Bash can execute the vast majority of scripts and thus is widely used because it has more features, is well developed and better syntax.

How do you write a case in bash?

1. Each case statement starts with the case keyword, followed by the case expression and the in keyword. ...
2. You can use multiple patterns separated by the | operator. ...
3. A pattern can have special characters .
4. A pattern and its associated commands are known as a clause.
5. Each clause must be terminated with ;; .

How do you set a variable in bash?

To create a variable, you just provide a name and value for it. Your variable names should be descriptive and remind you of the value they hold. A variable name cannot start with a number, nor can it contain spaces. It can, however, start with an underscore.

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.

How do you do if else in bash?

If the TEST-COMMAND evaluates to True , the STATEMENTS1 will be executed. Otherwise, if TEST-COMMAND returns False , the STATEMENTS2 will be executed. You can have only one else clause in the statement.

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 is case command?

case command in Linux is the best alternative when we had to use multiple if/elif on a single variable. It is used to execute the commands based on the pattern matching.

What is CASE statement in Linux?

The case statement allows you to easily check pattern (conditions) and then process a command-line if that condition evaluates to true. In other words the $variable-name is compared against the patterns until a match is found. ... The shell executes all the statements up to the two semicolons that are next to each other.

Which statement is used to close a case construct?

Case labels always end with a colon ( : ). Each of these cases is associated with a block. A block is nothing but multiple statements which are grouped for a particular case. Whenever the switch is executed, the value of test-expression is compared with all the cases which we have defined inside the switch.