More info on "DIfferences between...."

The list is in a file called "france" and contains users name like:

miko
martha

The file to control is the /etc/passwd:

miko:Sn83kdmcsd4ee:816:1005:MirceaKovari:/tmp:/bin/selfa
nikol:Sn83kdmcsd4ee:816:1005:NiklaOlman:/tmp:/bin/selfa

I need to put in a new file the line of user 
"miko"(miko:Sn83kdmcsd4ee:816:1005:MirceaKovari:/tmp:/bin/selfa) that is 
contained in the list(file france) but not "nikol" which is not contained 
and so on for ol the list and all the /etc/passwd file.Thanks

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