Unfortunately, it isn't always possible to use a graphical tool such as usercfg to manipulate users. In these instances, you can manipulate users with the command-line versions of using the tools called useradd, usermod, and userdel for adding, modifying, and deleting users, respectively.
To add a user with the useradd command,log in to the root account and enter the following command:
[root@insocoxygen /root]# useradd -d homedir -s /bin/tcsh [ic] -c "User's Real Name" newlogin
homedir is the home directory of the user being created, set by the -d option. User's Real Name is the real name of the user, added using the comment, -c, flag. (Be sure to have the ...