they only work with pattern matching, not complex conditions. So, while ‘case’ statements are a great tool to have in your bash scripting toolbox, they’re not a replacement for ‘else if’. It’s important to understand the strengths and ...
string1 == string2string1 = string2 True if the strings are equal. It will perform pattern matching when used with the [[ command. The = notation should be used with the test command for POSIX conformance. string1 != string2 True if the strings are not equal. ...
=operators are used, the string to the right of the operator is considered a pattern and matched according to the rules described below under Pattern Matching. If the shell option nocasematch is enabled, the match is performed without regard to the case of alphabetic characters. The return val...
Using if-else statement in bash You may have noticed that you don’t get any output when you run theroot.shscript as a regular user. Any code you want to run when an if condition is evaluated to false can be included in an else statement as follows: #!/bin/bash if [ $(whoami) ...
The regular expression is a very useful tool to match any content or search and replace the content of a file or in a string using a regex pattern. It can be used with the Bash script in different ways. The =~ symbol is used in the “if” statement of Bash to search any string. ...
Example 3 - Pattern matching in case statement Pattern matchingcan be used in case statements. I am using the same example from the previous section but adding an extra pattern(20[2-9][2-9])where if the user enters any year above 2021 it will print a message saying "series yet to hap...
Using ;;& in place of ;; causes the shell to test the next pattern list in the statement, if any, and execute any associ- ated list on a successful match. The exit status is zero if no pattern matches. Otherwise, it is the exit status of the last command executed in list. fi ...
# Code to be executed if the condition is false fi Q. How do I use the if-elif-else statement in a bash script to handle multiple conditions? Theif-elif-elsestatement in Bash allows you to handle multiple conditions sequentially, as in the example below. ...
pattern-N) commands;; *) commands;; esacCopy Thecasestatement works similarly to the switch case statement in otherprogramming languages. It starts with thecasekeyword followed by the$variableand theinkeyword. Every pattern is followed by commands that execute if a match is found. The statement...
are attempted after the first pattern match. Using ;& in place of ;; causes execu‐ tion to continue with the list associated with the next set of patterns. Using ;;& in place of ;; causes the shell to test the next pattern list in the statement, if ...