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Full Discussion: Auto-exit from telnet prompt
Top Forums UNIX for Dummies Questions & Answers Auto-exit from telnet prompt Post 302507395 by bhaskar_m on Wednesday 23rd of March 2011 05:45:25 PM
Old 03-23-2011
Auto-exit from telnet prompt
Hi,
Hope all your are doing well. Need a suggestion from you.
I am writing an automated shell script that will effectively check the telnet connectivity with different backends from present deployment server.

Ideally, this script reads each backend hostname from a configuration file and fires telnet command on that. like
Code:
telnet $hostname $port

but the catch here is, if the connection is established shell holds the prompts there, it does not automatically exits. I get something like

Code:
telnet  hostname 443
Trying **.***.***.*...
Connected to **.**.**.**
Escape character is '^]'.

Sometime if the remote host does not respond then it holds for long time,
Code:
telnet  hostname 443
Trying **.***.***.*...

This symbolises we need manual intervention clearly to come out. I want script should wait for certain interval if it does not get response come out and try next host.

Any ideas how to implement?
I can not use expect technogloy as it is not permitted in our environment.
I tried google and search in this forum as well, but did find a suitable approach.

Please let me know your ideas, any help would be very much appreciated.

Thanks in anticipation.
Regards,
Bhaskar
 

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LEARN ABOUT HPUX

nstrtel

nstrtel(5)							File Formats Manual							nstrtel(5)

NAME

       nstrtel - specifies the number of telnet device files the kernel can support for incoming telnet sessions

VALUES

   Failsafe
   Default
   Allowed values
       (Subject to available physical memory.)

       It  is best to use the default value, and there should not be any need to lower it.  However, if the simultaneous telnet connection load is
       very high, then the value of could be increased.

   Recommended values
       (Default value.)

DESCRIPTION

       The telnet daemon uses two STREAMS-based pseudo-terminal drivers and The kernel parameter, can be used to tune the number of  pseudo-termi-
       nals.   specifies  the  number of kernel data structures that are created at system boot time that are required to support the device files
       used by incoming telnet sessions on a server.  If the command or SAM is used to create more telnet device  files,  the  value  of  must	be
       increased  accordingly  or the device files cannot be used because there are no kernel data structures available for communicating with the
       system.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       When there is an increase in the load of telnet connections and there are no device files available to open telnet connections,	then  this
       kernel parameter should be increased.

       When  the error is encountered, then the device files have been exhausted and should be raised.	Once the value of is raised, should be run
       to create new device files.  (If SAM is used to raise the value of is run automatically.)

   What Are the Side Effects of Raising the Value of This Tunable?
       More resources would be consumed.  Extra kernel data structures, and extra device files may clog the system.

   When Should the Value of This Tunable Be Lowered?
       It is not advisable to lower the tunable value from the default value.  Consult HP Support before lowering this tunable	from  the  default
       value.

   What Are the Side Effects of Lowering the Value of This Tunable?
       Though not recommended, there would not be any side effects.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       insf(1M), telnetd(1M), telm(7), tels(7).

							     Tunable Kernel Parameters							nstrtel(5)
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