21

$ ftp 192.168.151.50  
Connected to 192.168.151.50.
220 (vsFTPd 3.0.3)
Name (192.168.151.50:adot): anonymous
331 Please specify the password.
Password: 
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
229 Entering Extended Passive Mode (|||9987|)
150 Here comes the directory listing.
226 Directory send OK.
ftp> ls -la
229 Entering Extended Passive Mode (|||39305|)
150 Here comes the directory listing.
drwxr-xr-x    2 0        118          4096 Mar 20  2017 .
drwxr-xr-x    2 0        118          4096 Mar 20  2017 ..
226 Directory send OK.
ftp> exit
221 Goodbye.