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Drop this script in a prim to have it follow the prim owner.

<lsl>
default
{
    state_entry()
    {
        vector pos = llGetPos();
        llSetStatus(STATUS_PHYSICS, TRUE);
        // Little pause to allow server to make potentially large linked object physical.
        llSleep(0.1);
        llMoveToTarget(pos,0.4);
        // Look for owner within 20 meters in 360 degree arc every 1 seconds.
        llSensorRepeat("", llGetOwner(), AGENT, 20.0, PI,1.0);
    }
    sensor(integer total_number)
    {
        // Get position of detected owner
        vector pos = llDetectedPos(0);
        // Offset back one metre in X and up one metre in Z based on world coordinates.
        vector offset =<-1,0,1>;
//        offset = offset*llDetectedRot(0);  //Adding this line will orient the follower relative to the owner's position.
        pos+=offset;
        llMoveToTarget(pos,0.4);     
    }
}
</lsl>