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Full Discussion: Problem with Recursive function
Top Forums Shell Programming and Scripting Problem with Recursive function Post 302105613 by hegemaro on Saturday 3rd of February 2007 09:24:55 AM
Old 02-03-2007
CPU & Memory
zazzybob's solution is an elegant and simple solution.

In response to recursion within a Korn shell function, there are two points to consider. All variables, including the current working directory, are global unless specifically defined with the function which then makes them local within the function.
Code:
typeset FILENAME=/etc/hosts

Function ()
{
    FILENAME=/etc/resolv.conf
    echo $FILENAME
}

echo $FILENAME
Function
echo $FILENAME

would produce

/etc/hosts
/etc/resolv.conf
/etc/resolv.conf

However,

Code:
typeset FILENAME=/etc/hosts

Function ()
{
    typeset FILENAME

    FILENAME=/etc/resolv.conf
    echo $FILENAME
}

echo $FILENAME
Function
echo $FILENAME

would produce
/etc/hosts
/etc/resolv.conf
/etc/hosts

A quick and dirty way to make variables local to the function INCLUDING the working directory is to execute the function in its own shell by placing parenthesis within the function brackets. The function will get its own copy of the environment when called and any changes, including the directory, to that environment will not be reflected in the calling script which is its own function.

Code:
typeset FILENAME=/etc/hosts

Function ()
{ (
    FILENAME=/resolv.conf
    echo $FILENAME
) }

echo $FILENAME
Function
echo $FILENAME

would produce
/etc/hosts
/etc/resolv.conf
/etc/hosts
Last edited by hegemaro; 02-03-2007 at 10:41 AM..
 

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