In programming, a subroutine is a sequence of program instructions that perform a specific task for reuse.
The subroutine has various names by program languages, is called 'function' by shell script. A function receives the data called arguments and returns its results. The form is as follows.
function function_name
{
processing
}
|
function_name ()
{
processing
}
|
Both are same. Arguments are described after function name at the time of execution. In program,
arguments can be referred by $1, $2, ....
In function of shell script, return sentence is used for returning the result.
‘return’ sentence ends the processing, and passes its result and control to origin.
