FTP, TELNET user control (transfer)_PHP tutorial

Author: Xiaozhou
man ftpaccess can find the restricted-uid parameter, then just add: restricted-uid * to the /etc/ftpaccess file. This method is suitable for wu-ftp 2.5 or above version.
How to make a general user only able to ftp up the machine
Author: Michael
To make a general user only able to ftp up the machine but cannot use telnet to this machine, you only need to do the following two steps: 1 , modify /etc/passwd, change the login shell at the end of the line corresponding to the user to /bin/true 2. Edit /etc/shells, add a line /bin/true at the end