it supports extended regular expressions, unlike POSIX case; the syntax is less clunky than case statements when there are few cases; One downside is that this is likely slower than case since it calls an external grep program, but I tend to consider performance last when using Bash. Syntax of the bash case statement is given below: Instead of checking all if-else conditions, the case statement directly select the block to execute based on an input. Bash Scripting Case Statement Examples. Case Statements. The if statement in BASH is adequate for testing a few conditions. The Case Statement The case statement is used to execute statements based on specific values. More Conditions using the BASH Case Statement. The case statement is useful and processes faster than an else-if ladder. In this example we will create a case statement that will tell us which Star Trek series a character was in. case is POSIX 7 Syntax: They are used when you have multiple different choices or selections. This lesson looks at using BASH case statements. We will not cover the case statement here, please check our article on case statement in bash scripting for that. Bash Shell scripting – The case statement March 21, 2017 admin Linux 0. Even though we could do the same using many elif condition tests a case statement is easier to read and more efficient. Case statements are generally used to simplify conditional processing. The provision of default value in the case statement comes to the rescue here. We will use a read statement to prompt for user input. Updated March 11, 2016 Often, you’ll find yourself trying to evaluate a variable’s value, looking for a specific value within a set of possible values. Switch (Case) Statment in Bash. It will help you to match several values against one variable and It is very similar to the switch statement in C language and is more readable so anyone can understand it easily. The basic syntax of the case command is as follows: The first two issues can be taken care of with the use of case statement in the select loop. The case statement will first expand the expression and then it will try to match it in turn with each specified case. It stops searching for a pattern once it has found it and executed the statement linked with it, which is almost opposite in case of the C switch statement. The ;;& operator is like ;;, except the case statement doesn't terminate after executing the associated list - Bash just continues testing the next pattern as though the previous pattern didn't match. Here is an example of a Bash case statement used in a shell script. Case statements are generally easier to read than multiple nested "if" statements. A Better Case For now, we introduce a case statement in our select loop. Adding each conditional test becomes cumbersome, though, when it needs to test more. We like easy to read and your computers like more efficient. Case Statement Syntax. When a match is found, all the statements are executed until the ;;. When working with bash scripts, the Bash Case Statement will help to test simple values including integers and characters.. Bash Case Statement Example. Even with the simple example we used when looking at extending the IF statement previously can be better written as a CASE statement. Often used in place of an if statement, if there are a large number of conditions. Create the first program using the case statement in a shell script. The Bash case statement takes a value once and tests that value multiple times. Yes, we can create even more conditions when we make use of the BASH Case Statement in our scripts. The Bash Case Statement is the simple form of the if-then-else statement in bash scripts. Using these terminators, a case statement can be configured to test against all patterns, or to share code between blocks, for example. 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