Working with CASE Switches in Bash Shell Scripting

In bash shell case statements are started with keyword case and ends with esac. In above syntax $VARIABLE will be the value which will be matched with patterns and the of matching pattern code block will be executed. All the program code must be ended with ;; .

1. How do you write a switch case in Shell?
2. How does case work in bash?
3. How do I switch to a bash script?
4. Which construct is used for switch statement in shell script?
5. What does Esac mean?
6. Which command is used to break the case blocks?
7. What is case command in bash?
8. What is exit in bash?
9. What is read in bash?
10. What is another name for a bash shell script?
11. What is shift in bash?
12. How do I exit a bash script?

How do you write a switch case 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.

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.

How do I switch to a bash script?

The Bash case statement has a similar concept with the Javascript or C switch statement. The main difference is that unlike the C switch statement, the Bash case statement doesn't continue to search for a pattern match once it has found one and executed statements associated with that pattern.

Which construct is used for switch statement in shell script?

In shell scripting switch case is represented using keywords case and esac which will do multilevel branching and checking in a better way than multiple if-else conditions. ... So, we will use a switch case conditional statement when we want to perform different operations on the outcome of a single expression.

What does Esac mean?

ESAC

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.

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.

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 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.

What is another name for a bash shell script?

Bash (AKA Bourne Again Shell) is a type of interpreter that processes shell commands. A shell interpreter takes commands in plain text format and calls Operating System services to do something.

What is shift in bash?

Shift is a builtin command in bash which after getting executed, shifts/move the command line arguments to one position left. The first argument is lost after using shift command. This command takes only one integer as an argument.

How do I exit a bash script?

To end a shell script and set its exit status, use the exit command. Give exit the exit status that your script should have. If it has no explicit status, it will exit with the status of the last command run.