Bash Iterate Array Examples

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Functions in Bash shell scripts allow you to group a set of commands together and call them from multiple places in your script. Here are some examples of how to define and call Bash shell script functions:

  1. Define a function that prints a message to the console:
    function my_function {
    echo "Hello, World!"
    }

    You can then call the my_function function by typing:

    my_function

    This will print “Hello, World!” to the console.

  2. Define a function that takes arguments and performs a calculation:
    function calculate {
    result=$(($1 + $2))
    echo "The result is: $result"
    }

    You can then call the calculate function and pass two arguments by typing:

    calculate 10 20

    This will print “The result is: 30” to the console.

  3. Define a function that returns a value:
    function get_greeting {
    echo "Hello, $1!"
    }

    You can then call the get_greeting function and store the result in a variable by typing:

    greeting=$(get_greeting "John")
    echo $greeting

    This will print “Hello, John!” to the console.

  4. Define a function that uses a local variable:
    function local_variable {
    local my_var="This is a local variable"
    echo $my_var
    }

    You can then call the local_variable function by typing:

    local_variable

    This will print “This is a local variable” to the console.

These are just a few examples of how to define and call functions in Bash shell scripts. You can use functions to simplify your code and make it more modular and reusable.

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