bash case statement

Case statements are generally easier to read than multiple nested "if" statements. The case statement is useful and processes faster than an else-if ladder. They are used when you have multiple different choices or selections. Case Statement Syntax. The basic syntax of the case command is as follows: Yes, we can create even more conditions when we make use of the BASH Case Statement in our scripts. The Case Statement The case statement is used to execute statements based on specific values. Case Statements. The provision of default value in the case statement comes to the rescue here. This lesson looks at using BASH case statements. 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. When a match is found, all the statements are executed until the ;;. case is POSIX 7 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. Create the first program using the case statement in a shell script. For now, we introduce a case statement in our select loop. The Bash case statement takes a value once and tests that value multiple times. A Better Case 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. Case statement doesn’t work too well with integers, but using it works superb when testing alphabetical ranges. Using these terminators, a case statement can be configured to test against all patterns, or to share code between blocks, for example. 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. Adding each conditional test becomes cumbersome, though, when it needs to test more. We like easy to read and your computers like more efficient. Syntax: Syntax of the bash case statement is given below: In this example we will create a case statement that will tell us which Star Trek series a character was in. Bash Scripting Case Statement Examples. When working with bash scripts, the Bash Case Statement will help to test simple values including integers and characters.. Instead of checking all if-else conditions, the case statement directly select the block to execute based on an input. Even with the simple example we used when looking at extending the IF statement previously can be better written as a CASE statement. The Bash Case Statement is the simple form of the if-then-else statement in bash scripts. The case statement will first expand the expression and then it will try to match it in turn with each specified case. 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. Bash Case Statement Example. Case Statements. More Conditions using the BASH Case Statement. We will use a read statement to prompt for user input. Case statements are generally used to simplify conditional processing. Often used in place of an if statement, if there are a large number of conditions. Here is an example of a Bash case statement used in a shell script. The first two issues can be taken care of with the use of case statement in the select loop. 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. 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