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What is case command in Linux?
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.
How do you write a case in Linux?
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 in shell scripting?
A case construct helps us to simplify nested if statement. You can match several variables against one variable. Each case is an expression matching a certain pattern.
Which command is used for switch case in Linux 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. Switch case will need an expression which it needs to evaluate and need to perform multiple operations based on the outcome of the expression.
What is root Linux?
Root is the superuser account in Unix and Linux. It is a user account for administrative purposes, and typically has the highest access rights on the system. Usually, the root user account is called root . However, in Unix and Linux, any account with user id 0 is a root account, regardless of the name.
How to use the case statement in Linux?
;; “banana”) echo “I like banana nut bread.” ;; “kiwi”) echo “New Zealand is famous for kiwi.” ;; esac New Zealand is famous for kiwi. A good use for a case statement is the evaluation of command line arguments as follows −
How does the case command in Bash work?
It works like a switch-case statement of other standard programming languages. This command starts with ‘case’ statement and closes by ‘esac’ statement. No break statement is used in the case command and double bracket (;;) is required to mention the statement (s) for any particular matching.
How to use case to execute a command?
case – To conditionally perform a command, case will selectively execute the command-list corresponding to the first pattern that matches word. SYNOPSIS. case word in [ [(] pattern pattern]…) command-list ;;]… DESCRIPTION. The ‘ ‘ is used to separate multiple patterns, and the ‘)’ operator terminates a pattern list.
How to conditionally execute a command in Linux?
case – Unix, Linux Command – case – To conditionally perform a command, case will selectively execute the command-list corresponding to the first pattern that matches word.