Dear All, I have two files file1 and file2, either of which have many variables with quite a few in common. I know, if I can find what variables are in common, I could use "ncks -A -v " variables in common" file1 file2 " to update those variables in file1 using values in file2. However, I am wondering if there are simple options to do this: udpate variables of files using their values in file2 if they exist. Your help is appreciated.