function command in Linux with examples

Function is a command in linux which is used to create functions or methods. 

1.using function keyword : A function in linux can be declared by using keyword function before the name of the function. Different statements can be separated by a semicolon or a new line. 
SYNTAX

function name { COMMANDS ; }

2.using parenthesis : A function can also be declared by using parenthesis after the name of the function. Different statements can be separated by a semicolon or a new line. 
SYNTAX

name () { COMMANDS ; }

3.Parameterised function : 

$1 will displays the first argument that will be sent and $2 will display the second ans so on… 

4.help function : It displays help information. 

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