How do you multiple user add in Linux at atime by scripting?

Answer 1

My preferred approach is to use an awk or perl script to take the raw information about a user and create as output the useradd or adduser command to create the account.

Once this is put into a file I just run the file as a script (readable and executable) as an administrative user and it creates the accounts.

I've used this approach to create multiple users for multiple classes each semester and it works very well. You need to use a text manipulation scripting language to do this; the standard shell programming makes it difficult to do.