Using global variables in functions with parameters in bash

Question

I'm trying to catch a return value from a function in bash, that modify a global variable. Works perfectly with funtions with no parameters:

#!/bin/bash

tes=2
testfunction(){
        tes=3
        tes_str="string result"
        return 0
}
if output=testfunction; then
        echo "OK"
else
        echo "KO"
fi
echo $tes
echo $tes_str

But no with parameters:

#!/bin/bash

tes=2
testfunction(){
        tes=3
        tes_str="string result"
        return 0
}
if output=$(testfunction "AA" "BB"); then
        echo "OK"
else
        echo "KO"
fi
echo $tes
echo $tes_str

Because for bash, parameters ("AA" or "BB") are a command, and I must put it in backets (but if use backets, can't modify global variables). How can I do it? I'm stucked. Regards

Answer 1

Why use output? Just remove it and run the function.

if testfunction; then

Notes:

• output=testfunction is assigning the text testfunction to the variable output.
• output=$(testfunction) will not work, because $(...) runs everything inside a subshell.