monitor telnet

[icu812]

I have a system (SP node) that I cannot telnet to at times. I can ping it but I cannot telnet to it. I need to write a korn shell srcipt that will alert me when users cannot telnet to this machine. I currently have the following:
#!/bin/ksh
host=sp18
telnet $host 1>/tmp/telnet.out 2>&1
foo=`grep respond /tmp/telnet.out`
if [ "$?" -eq "0" ] ; then
echo "Host $host does not respond"
fi

when the system is up and running and telnet is working fine, the script hangs. Can someone please help me get over this problem? Thanks alot

 

[TheLexx]

Hi,
The script appears to hang as it is waiting for a login to be entererd. To overcome this modify the telnet as follows:

telnet $host 1>/tmp/telnet.out 2>&1 <<EOF
^]
quit
EOF

The ^] enters telnet subcommand mode, in which a quit can be entered (to enter ^] press Ctrl+v, Ctrl+]).

Hope this does the trick.