Shell Programming and Scripting

need to login 4 systems to check whether the systems are accessible or not using rlogin command,after each login i will exit.After issuing the command rlogin abc if it is not responding i will get a message of "connection timed out" . So i want to automate this task .so i tried like below:
EX:

Code:

Code:

rlogin abc <<EOF
 6
 EOF
 rlogin xyz <<EOF 
    n     
6
 EOF
 rlogin  pqr <<EOF     
6     
EOF     
rlogin klv <<EOF 
    n
 6 
    EOF

But how can i check if the system responds or not.

When i do
Code:

Code:

rlogin abc

and the system throws an error
Code:

Code:

"Connection Timed out "

then i want it as notification through mail. else it should continue with the process.

Any help greatly helps me Linux

Moderator's Comments:

Please use CODE tags correctly as required by forum rules!

Welcome to the forum.

Please be aware that rlogin is NOT today's tool of choice to connect to network nodes; you may want to consider secure tools, e.g. ssh, instead (if rlogin hasn't been aliased to ssh on your system anyhow, that is).

For error conditions as described you may want to check the command's exit code, either with an if construct:

Code:

if rlogin abc; then ... ; fi

or by evaluating the shell variable $?

Code:

ERRC=$?

IMMEDIATELY after the command was run.

EDIT: With your "here documents" (the data between EOF and EOF), the remote system will try to execute the lines as commands, and if 6 and n are not installed / aliased, you'll have error exit codes as well, although the nodes are readily available on the net.

For a HERE document written in the OP's way, wouldn't the EOF have to be in the leftmost column?

Yes, of course, I forgot to mention that. It only showed up when I introduced the code tags.