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Hi Thank you for your help but I am afraid I am being remarkably dense. What I want to do is check that the user is or is not a member of uucp. If he is not I need to add him. The following works (except the gpasswd bit which I will test on another machine! (What faith!!). #! /bin/sh groups > temp if grep -w 'uucp' temp; then echo "thats great," ${USER} "is a member of uucp" else echo "Oh Dear" # sudo gpasswd -a ${USER} uucp fi rm temp However I do not think it is very elegant, and I do not like putting temp files on other peoples machines. All the best Peter L-J -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html