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What is a function it is basically lines of code which can be called multiple times within a script.

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Functions can be created in two ways in the first the way we are specifying a function name followed

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by parentheses and then inside Carol-Lee brackets are lines of code which will be processed.

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Second option is to create function using keyboard function then is a name of your function.

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And inside the brackets are lines of code which will be processed in this option.

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We don't need to use parentheses after name of our function but we need to specify keyboard function.

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Here is the example of how we can call function.

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Hello from the script and it is really simple.

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We just use the name of that function.

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In my case.

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Hello.

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And you may notice that declaration of function Hello is that before the actual calling using function

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name.

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Hello.

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This is all you need to remember.

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Function can be called from some place only if declaration of that function Vasa before actual calling

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we can of course use arguments when using functions.

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Imagine function as some M.R. scrape inside your script here.

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For example the calling function.

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Hello.

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And we are giving to that function one argument name.

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Richard as a result function will print hello and value of first argument which is.

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Richard we can also exit from function using the return keyboard.

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If you use a written keyword we only exit from function not from a script.

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And similarly with exit status we can ask for a function that returns status using dollar sign questionmark

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year we would get a written status 11 in functions.

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We can define local variables or does that means.

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It means that local variable is visible only inside the function it was declared.

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Here we can see the difference in example on the left side example we are reading the name Richard into

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a variable name then we are calling a function.

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Hello that argument.

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Peter inside function well we assign into variable name Ververs previously value Richard value of argument

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1 which is beat Peter after the function is finished.

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We are a printing value of variable name which is Peter because we assign this value into variable name

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in the function.

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Hello.

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On the right side example we are reading the name Richard into variable name then calling function a

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hello with argument.

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Peter an inside function.

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Hello we are signing into a local variable name value of argument 1 which is Peter when the function

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is finished we are printing Valo of variable name which is richer because we have change only a local

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variable name not the global one variable stored value.

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Richard.