Shell Programming and Scripting

#! /bin/ksh
MQV=`dspmqver|grep Version| awk '{print $2}'| sed 's/\.//g'`
if [ $? -gt 0 ]
then
MQV=`mqver|grep Version| awk '{print $2}'| sed 's/\.//g'`
fi

os=`uname`
sw=$MQV

if [ "$os" = Linux ] && [ "$sw" GE 6 ]; then

./m.sh[2]: dspmqver:

OLDIFS="$IFS"
IFS=":"

for DIR in $PATH
do
        for X in dspmqver mqver
        do
                [ -e "$DIR/$X" ] && CMD="$X"
        done
        [ ! -z "$CMD" ] && break
done

if [ -z "$CMD" ]
then
        echo "dspmqver and mqver not found"
        exit 1
fi

IFS="$OLDIFS"

MQVER=`$CMD | grep Version| awk '{print $2}'| sed 's/\.//g'`

OLDIFS="$IFS"
IFS=":"

for DIR in $PATH
do
        for X in dspmqver mqver
        do
                [ -e "$DIR/$X" ] && CMD="$X"
        done
        [ ! -z "$CMD" ] && break
done

if [ -z "$CMD" ]
then
        echo "dspmqver and mqver not found"
        exit 1
fi

MQVER=`$CMD | grep Version| awk '{print $2}'| sed 's/\.//g'`

what it the condiong should i use here instead of
 if [ "$os" = Linux ] && [ "$sw" GE 6 ]; then

case $os in

   "OS1") <get software version in way 1>;
         if [ "<software version>" = "A" ]
	 then
          <script1>
	 fi;;
   "OS2") <get software version in way 2>;
         if [ "<software version>" = "B" ]
	 then
          <script2>
	 fi;;
   "OS3") <get software version in way 3>;
         if [ "<software version>" = "C" ]
	 then
          <script3>
	 fi;;
   "OS4") <get software version in way 4>;
         if [ "<software version>" = "D" ]
	 then
          <script4>
	 fi;;
esac