Linux System Calls Question:

firstly create the user.
useradd surendra
passwd surendra

then opne the FTP file:-
vi /etc/vsftpd/vsftpd.conf
add this line at the end of the file
userlist_deny=NO

then open this file,
vi /etc/vsftpd/user_list

and add the above created user in this file to access FTP
services.

and restart the FTP services
/etc/init.d/vsftpd start
chkconfig vsftpd on ( for permanent on )