How To: "Ping" FTP Server List

[jacorobo]

Hi all,

I've a problem concerning a "network" of ftp servers to which I have to connect one after the other. The problem consists in the reply from not available servers that hangs without response (no messages such as "Connection refused" or "Destionation unreachable").

Do you know any commands to manage ftp replies or to test ftp connection before it hangs??

Thank you for your attention.

Jacorobo

[hysterik]

Hi all,

I've a problem concerning a "network" of ftp servers to which I have to connect one after the other. The problem consists in the reply from not available servers that hangs without response (no messages such as "Connection refused" or "Destionation unreachable").

Do you know any commands to manage ftp replies or to test ftp connection before it hangs??

Thank you for your attention.

Jacorobo

There are a lot of possibilities. One example would be to write a shell script which pings the server, before you attempt to log into it. Perhaps something like

for i in server1 server2 do
  ping -c1 $i >/dev/null 2>/dev/null
  if [ $? = 0 ]; then
    ftp $i < somescript
  fi
done

[jacorobo]

Thx hysterik.

However we found a solution that consists in:

- launching ftp
- catch PID of ftp connection
- sleep for n seconds
- ps, looking for the PID and its status (S = 'Sleep')
- if status = S then kill
else
connect

It works fine! ;-)