topic global variables in Operating System - Linux

global variables

Gemini_2 — Fri, 05 May 2006 14:13:27 GMT

I use ksh and have the following function

function fun1 () {
source=$1
target=$2
}

function fun2 () {
echo $source
echo $target
}

it will not echo $source and $target, because they were defined in a function. how can other function use it? I dont wish to define it in the main....too messy if I have more variables.

Re: global variables

James R. Ferguson — Fri, 05 May 2006 14:39:33 GMT

Hi Gemini:

Actually, the way you have written this, 'source' and 'target' are global once you have called 'fun1'.

If you call 'fun2' first and then 'fun1' the 'source' and 'target' are undefined.

If both functions need to see the variable it must be either global (in main) or you must pass it to function. Within a function you can localize a variable by declaring it with a 'typeset'.

function fun1 {
typeset source=$1
typeset target=$2

Regards!

...JRF...

Re: global variables

Gemini_2 — Fri, 05 May 2006 15:08:54 GMT

yes, I think that I have my function reversed......thank you!!