evmwatch man page on DigitalUNIX

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evmwatch(1)							   evmwatch(1)

       evmwatch - Monitors EVM events

       evmwatch [-A] [-f filter_expr] [-h hostname[:port_no]]...

       [-t show_template] [-w timeout] [-i | -x] [-R reconnect-timeout]

       Automatically  starts  evmshow  to  produce  a formatted display of the
       received events.	 Subscribes for notification of events	matching  fil‐
       ter_expr.  See  EvmFilter(5) for the syntax of filter_expr. By default,
       the evmwatch command subscribes for all events.	Attempts to connect to
       the  EVM	 daemon on the host hostname, rather than to the local daemon.
       If a cluster alias is specified for hostname, attempts  to  connect  to
       the  EVM	 daemon on that cluster. If specified, the port number must be
       the same as the portnum specified in the EVM daemon configuration file,
       evmdaemon.conf(4). In most cases, the default should be used.

	      If  connecting to a cluster alias, evmwatch monitors events that
	      are posted on all members of the cluster.

	      If :port_no is specified, port_no is used for TCP	 communication
	      with  remote  clients;  otherwise,  the evm port number found in
	      /etc/services is used. If no entry is  found  in	/etc/services,
	      the  reserved  default value of 619 is used.  Template string to
	      be passed to evmshow if the -A option is also specified. If  the
	      -A  option  is  not  specified,  this  argument  is ignored. See
	      evmshow(1) for a description of the template string.  Terminates
	      if  no event is processed in the time specified by timeout.  The
	      format of	 timeout  is  [[[days:]hours:]minutes:]seconds,	 where
	      days,  hours and minutes can be any integer up to 9999, and sec‐
	      onds can be any integer  up  to  9999999.	  Omitted  values  are
	      interpreted as zero.  If the converted value exceeds 100,000,000
	      seconds, it is automatically reduced to that value with no error
	      being  reported.	The  timer  is restarted each time an event is
	      received.	 Retrieves copies of all of the registered event  tem‐
	      plates from the EVM daemon that match the supplied filter string
	      and for which the user has access authorization. It  writes  the
	      templates	 to  stdout  as EVM events and terminates.  Terminates
	      with a zero exit value as soon as the first event matching  fil‐
	      ter_expr	is processed.  Specifies the period for which evmwatch
	      should continue to attempt to reconnect if the connection to the
	      EVM   daemon   is	 lost.	The  format  of	 reconnect-timeout  is
	      [[[days:]hours:]minutes:]seconds, where days, hours and  minutes
	      can be any integer up to 9999, and seconds can be any integer up
	      to 9999999. Omitted values are interpreted as zero.  If the con‐
	      verted  value  exceeds  100,000,000 seconds, it is automatically
	      reduced to that value with no error being reported.

	      If reconnect-timeout is zero, evmwatch terminates immediately if
	      a	 disconnection	occurs.	 If  this option is not specified, the
	      reconnection timeout is set to five minutes for a local  connec‐
	      tion and 60 minutes for a remote connection.


       The  evmwatch  command  subscribes  to the events specified by the fil‐
       ter_expr and passes all events to its stdout  stream  as	 they  arrive.
       Output is in the form of raw EVM events.

       If  the	-A  option is specified, evmwatch automatically starts evmshow
       and pipes the event stream into it, producing a	formatted  display  of
       events. If a show_template argument is supplied, the specified template
       string is passed to evmshow through its own -t option.  See  evmshow(1)
       for more information.

       If evmwatch cannot connect to the EVM daemon, it terminates immediately
       with an error message. If it succeeds in	 connecting  but  subsequently
       loses  the  connection, it attempts to reconnect periodically until the
       reconnect-timeout period expires. The retry period is  one  second  for
       the first minute, and five seconds thereafter.

       The  evmwatch command rejects attempts to output raw events to a termi‐
       nal device.

       The evmwatch command receives events only for which the user has access
       authorization. See evm.auth(4) for details of access authorization.

       The  following exit values are returned: Successful completion An error
       occurred, including timeout

       The following ksh example watches for all events with a priority of  at
       least  200  and displays them on stdout. Events are piped automatically
       through	evmshow	 to  produce  a	 formatted  event   display.	export
       EVM_SHOW_TEMPLATE="@timestamp  [@priority]  @@" evmwatch -A -f "[pri >=
       200]" The following example waits until some other process posts a par‐
       ticular	event  and  then continues. Redirection of output to /dev/null
       implies that the content of the event is of no  concern.	  evmwatch  -f
       "[name myco.ops.backup.done]" -x >/dev/null The following script builds
       on the prior example. It waits for five minutes (300 seconds)  for  the
       event  to  occur	 or  exits  as soon as the event happens.  #! /bin/ksh
       evmwatch -f "[name myco.ops.backup.*]" -x -w 300 >/dev/null if [ $? -eq
       0 ] then
	  echo Backup completed!  else
	  echo	Backup	timed out!  fi The following shell script waits for up
       to five minutes (300 seconds) for a pulse event to  be  received.  Each
       time  the  pulse arrives, the timer is reset and evmwatch waits for the
       next pulse. If the timer expires, evmwatch  terminates  with  an	 error
       code,  a warning is displayed, a high priority event is posted, and the
       script exits.  #! /bin/ksh evmwatch -f "[name myco.myapp.remote.pulse]"
       -w 300 >/dev/null if [ $? -ne 0 ] then
	  echo `date` Pulse monitor: No pulse from remote system
	  evmpost <<END
	     event  {		   name	    myco.myapp.pulsemon.no_pulse
       priority 650	     } END  fi	The  following	example	 monitors  all
       events occurring on a remote host. If the connection to the remote host
       is lost, evmwatch attempts to re-establish the  connection  for	up  to
       three  days  before terminating.	 evmwatch -A -h yoursys -R 3:0:0:0 The
       following example lists the names of all	 registered  events  that  the
       user is authorized to access.  evmwatch -i | evmshow -t "@name" | more

       Definition of the sockets and protocols used for Internet services.

       Commands: evmget(1), evmpost(1), evmshow(1), evmsort(1), esmd(8)

       Files: evmfilterfile(4), services(4)

       Event Management: EVM(5)

       EVM Events: EvmEvent(5)

       Event Filter: EvmFilter(5)

       System Administration


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