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Shell Programming and Scripting

checking a connection

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# 1  
Old 08-17-2005
checking a connection
Hello,

Is it possible to check if a host is accepting connections on a particular port using a shell script? Can't we automate telnet to check for the same?

Thanks in advance
Azmath H Shaik
# 2  
Old 08-17-2005
Sure.
Code:
#!/bin/ksh
telnet yourhost 25 << EOF
^]
EOF
exit

I leave it to you to find how to check if it was successful. Just change the port to what you need - I didn't test to see if it would work with all the different ports.
# 3  
Old 08-20-2005
It works fine for all ports (atleast for me). I dump the output to a temporary file and do a grep for string "connected" to check if the connection was successful!
Thanks
# 4  
Old 08-20-2005
You don't need to dump the output and grepping on it.
You can only check the status of the "telnet" command :

Code:
#!/bin/ksh
telnet yourhost 25 << EOF
^]
EOF
if [[ $? -ne 0 ]] ; then
  Do what you need
fi

Nir
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