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Full Discussion: Help on ping command
Top Forums UNIX for Dummies Questions & Answers Help on ping command Post 302537213 by rbatte1 on Thursday 7th of July 2011 11:30:37 AM
Old 07-07-2011
I think that you are being impatient and/or not limiting the number of attempts to make.

Assuming that you fire off ping with a count (else it keeps trying forever) then a valid address will show you the responses and exit. Similarly, an unresponsive address will keep trying forever, however only responses cause a display, so it may appear that your ping is just hanging, but in actual fact it is still trying each second. You don't get a "timed out" type message each failure like on Windows.


Depending on your operating system the flags change slightly, so read the man page to confirm exactly what you need, but if you try:-
Code:
ping -c1 $target

... you will have a simple yes/no test. An unresponsive attempt will timeout in 10 seconds. It may be a bit painful if you have many addresses that don't respond, but you could batch them up and send out multiple queries at a time. Be careful though else you might swamp your server and/or network and annoy people a little.

If you have a file of addresses, you could try (in ksh):-
Code:
#!/bin/ksh
cat address.file | while read target
do
   ping -c1 $target
   if [ $? -eq 0 ]
   then
      echo "$target"
   else
      echo "$target" >&2
   fi
done > live_addresses 2>dead_addresses

This will create two output files.


I hope that this helps, but feel free to ask more if I haven't been clear.




Robin
Liverpool/Blackburn
UK
 

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LEARN ABOUT SUNOS

jms-ping

asadmin-jms-ping(1AS)						   User Commands					     asadmin-jms-ping(1AS)

NAME

       jms-ping  - checks to see if the JMS provider is up and running

SYNOPSIS

       jms-ping   --user  admin_user  [--password  admin_password]  [--host  localhost]  [--port  4848]  [--passwordfile  filename]  [--secure|-s]
       [--terse=false] [--echo=false] [--interactive=false]

       Checks to see if the JMS provider is up and running. This command is supported in remote mode only.

OPTIONS

       --user		       authorized domain application server administrative username.

       --password	       password to administer the domain application server.

       --host		       machine name where the domain application server is running.

       --port		       port number of the domain application server listening for administration requests.

       --passwordfile	       file containing the domain application server password.

       --secure 	       if true, uses SSL/TLS to communicate with the domain application server.

       --terse		       indicates that any output data must be very concise, typically avoiding human-friendly sentences and favoring well-
			       formatted data for consumption by a script. Default is false.

       --echo		       setting to true will echo the command line statement on the standard output. Default is false.

       --interactive	       if set to true (default), only the required password options are prompted.

       Example 1: Using jms-ping

       asadmin> jms-ping --user admin --password adminadmin --host bluestar --port 4848 server1
       JMS Ping Status=RUNNING

EXIT STATUS

       0		       command executed successfully

       1		       error in executing the command

       asadmin-create-jmsdest(1AS), asadmin-delete-jmsdest(1AS), asadmin-list-jmsdest(1AS)

J2EE 1.4 SDK							    March 2004						     asadmin-jms-ping(1AS)
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