copy curves

gistfile1.py

import maya.cmds as cmds

def copyCurve(src,trg):
    
    cvs=cmds.getAttr(src+'.spans')+1
    
    for count in range(0,cvs):
        
        srcCv=cmds.getAttr(src+'.cv[%s]' % count)[0]
        
        cmds.move(srcCv[0], srcCv[1], srcCv[2], trg+'.cv[%s]' % count,os=True)

ns='rig:'

for node in cmds.ls(selection=True):
    
    if cmds.objExists(ns+node):
        copyCurve(node,ns+node)