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In Linux world, one would have frequently come across the init script, which is nothing but a script that helps in configuring the daemons of the Linux system. Now one major thing it would strike your mind at this point in time is how does it play in day to day scripting and if there are any major scenarios where these case statements are used. We would understand this statement through an example in our next section and also look at some output of different cases to help give you a real flavor of the theory topic. This pattern is like a keyword for any fallback options in case of case statements. One clear thing we can notice is that the default statements are mentioned under *). In case of no pattern matching these statement(s) will be executed. Statement(s) to be executed if 3 rd pattern matches Statement(s) to be executed if 2 nd pattern matches
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Statement(s) to be executed if 1 st pattern matches
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Web development, programming languages, Software testing & others Start Your Free Software Development Course In cases of no match of the expression, the default condition statements will be executed. What the interpreter does is that the expression is checked against each value until a match is found. One more thing to keep in mind is that, in the case of many conditions been checked for, if none of the condition matches, there should always be a default condition to fall out for and be used in any of the default conditions. Several statements in-between case … esac would be executed to find a match for the pattern which will be specified at the start of the condition. The case … esac statement as it is called, starts with a case, and once when the user wants to end the loop, enters esac and in between these keywords are the lines which include conditions which one would need to check for in terms of pattern. If someone wants to simply visualize what a case statement does, it can be answered as: the 20-25 conditions which need to be checked are checked at different stages without having to branch them under any other if else loop and eventually brings up cleanliness in the way the code is written, developed and maintained. At that point, case statements come to the rescue.
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Imagine a condition where you would have to apply a lot of if conditions with different level of branching at different levels, for example in some code we might have to check for 20-25 conditions, it is very difficult in developing the loop and even harder is the effort needed to maintain or update them. The case statement is one of such utility that enables the user to build some functionality without having to get into a lot of hassle handling the branching conditions.