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how to send data on a port n return on # prompt

Posted on 2003-12-10
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Last Modified: 2010-04-21
Hi all,
 
I want to send some data or a packet to a tcp port on a socket.
I tried
# telnet <ipaddr> <port no> < test
where test is a file contains a packet.
 
It gives me acknowledgment, but it doesnt come out from the connection. And do not accept escape char eg. ^] or ^D.
I have to kill the process to terminate.
 
How to return on # prompt without killing the process?
Bcos i want to schedule the same process.
 
Please suggest.
 
Thanks,
rishi
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Question by:rishi_dongre
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7 Comments
 
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Accepted Solution

by:
liddler earned 50 total points
ID: 9911701
what about notup and running in background?
nohup telnet <ipaddr> <port no> < test &

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Author Comment

by:rishi_dongre
ID: 9911917
hi liddler,
Your cmd gives me # promt but it dosent close the connection.
Means "telnet" session running continueously.
I want the telent connection also be closed.(The msg like "Connection closed by foreign host")
I m killing the session manually and it kills the connection established with socket.

regds,
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LVL 11

Expert Comment

by:griessh
ID: 9911970
rishi

Could you let us know what's in your <test> file?

=====
Werner
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Expert Comment

by:liddler
ID: 9912005
you can kill the pid of the telnet session,
i.e.
ps -ef | grep telnet
to get the pid
then kill (or kill -9) the pid
IF it was the last command you ran from the command line
kill -9 %1
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Author Comment

by:rishi_dongre
ID: 9912050
Griessh,
Its a data packet which i send to the server's port and the application read it and acknowledge accordingly.
eg. test file-- 123ADFD3ERE12123432FDSF3434
# telent 123.23.23.12 1234 < test
Connecting to ..
Escape char '^]'
345FKD9094 ( this is the acknowledgement)

And if i do following, i m succeeding.
# telnet 123.23.23.12 1234
Connecting to...
Esccape char...
123ADFD3ERE12123432FDSF3434 ( here i m pasting the string)
345FKD9094Connection close to foreign host
#
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Author Comment

by:rishi_dongre
ID: 9912069
hi lidder,
I m doing the same already. But i m looking for the best way bcos i want to schedule it thru cron.
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LVL 18

Expert Comment

by:liddler
ID: 9912219
#!/bin/ksh
telent 123.23.23.12 1234 < test &
sleep 5
kill $!

As the script that cron calls
i.e. do the telnet, sleep (maybe 5 seconds is too long, or you may not need any sleep), then kill the previous backgroud job (i.e. the telnet)
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