[JCOP Shell] how to get the result of a script into a variable ?

Hello all,
I have a jcsh script that swaps the Two nibbles of an hexadecimal number.
#swap.jcsh
X= 0xAB
R= $(/expr $(/expr ${X} << 4 ) + $(/expr ${X} >> 4 )  )
/echo 0x${R;h2} the value echoed is 0xBA, right.
now, I want to replace the X varibale by an argument variable ( ${1} ) and , instead of echoing the result, storing it into another varibale; example :
Y= swap 0x23this is not working. ;-(
Does anyone knows how to do it ? is there a "return" equivalent to put at the end of my "swap" script ?
mkdata are you there ? :)
Kartagos

Thank you very much mkdata
I solve it temporarely by using a global Variable TEMP that will be used by scripts to store the result, then the caller script will simply read the value of this variable (old old school global variable method :) )
now I'm considering re-writing my libraries
I knew that there something "DEFUN" but i didn't find any help (when typing "help /error" it talks about something called "defun")
I think I should write to the JCOP Team to update their docs.
Regards
Khaled

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