Bash Case Statement

1. How do you write a case statement in bash?
2. What is case in bash script?
3. How do you write a case statement in Shell?
4. What is CASE statement in Linux?
5. What is exit in bash?
6. Which command is used to break the case blocks?
7. How do you do if in bash?
8. What is read in bash?
9. How do you increment in bash?
10. How do you call a function in bash?
11. What is case command?
12. Which statement is used to close a case construct?

How do you write a case statement 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 ;; .

What is case in bash script?

Bash case statement is the simplest form of the bash if-then-else statement. Syntax of bash case statement. ... Case statement first expands the expression and tries to match it against each pattern. When a match is found all of the associated statements until the double semicolon (;;) are executed.

How do you write a case statement in Shell?

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 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.

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.

Which command is used to break the case blocks?

break command is used to terminate the execution of for loop, while loop and until loop. It can also take one parameter i.e.[N]. Here n is the number of nested loops to break.

How do you do if in bash?

A Shell script usually needs to test if a command succeeds or a condition is met. In Bash, this test can be done with a Bash if statement.
...
What are the Bash Conditional Expressions?

What is read in bash?

What is read? Read is a bash builtin command that reads the contents of a line into a variable. It allows for word splitting that is tied to the special shell variable IFS. It is primarily used for catching user input but can be used to implement functions taking input from standard input.

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 call a function in bash?

To invoke a bash function, simply use the function name. Commands between the curly braces are executed whenever the function is called in the shell script. The function definition must be placed before any calls to the function.

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.

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.