nixCraft

I am using Fedora 9 linux. I am wondering how can I add a group of users from an input file (plan text file) and specify that the script can only be executed by administrator or users with administartors right. I have been trying some codes such as this but im not sure if its right or wrong.

vi file1.sh
cat userlist | while read xyz
do
useradd "$xyz"
done

and then I made vi userlist and added the names such as Tom, sue, pat, Joe in it then ./file1.sh to execute it.

another code is: vi file2.sh
cat $1 | while read username fullname
do
useradd -c "$fullname" "$username"
done
then i created vi userlist4 and added the names such as: Tom Hanks, Joe mason, Jim Joseph. then executed using cat /etc/passwd command.

so i want to know which code is the right one to add a group of users from an input txt file??? If none of the above code is right could you please provide me with a code. thanks.

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