How to define a new Linux user?

# useradd -d /home/alper -g gpalper -s /bin/csh -m alper -u 1008
# passwd alper

To check it:
$ egrep -i "^alper" /etc/passwd
$ egrep -i "^gpalper " /etc/group
or
$ grep alper /etc/passwd
$ grep gpalper /etc/group