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evmshow(1)							    evmshow(1)

       evmshow - display an EVM event

       show_template]	 timespec]   item_list]	  config_file]	 filter_exprt]
	      skip_count] show_count] [filename

       The command is EVM's event formatter.  It reads raw EVM	events	either
       produced by other EVM commands or stored in a file and converts them to
       display format for viewing.  Events are read from  if  no  filename  is
       specified  or if filename is Formatted output is written to The command
       can be also used as a filter, producing a selected set of raw events as
       its output.

       If none of the or options is specified, each event is formatted accord‐
       ing to the following rules and written to as a single line of text.

       If the option is included, the supplied show_template string is used to
       format the event.  If the option is omitted but the variable is present
       in the environment, the value of the variable is used as the  show_tem‐
       plate.	If  no show_template is available, a default value of is used.
       The is explained in more detail later in this section.

       A show_template is a string that contains event data item specifiers of
       the form width], where item_name is the name of any standard event data
       item, such as or and width.  The width is the minimum number of charac‐
       ter  spaces  the	 value	should occupy.	See EvmEvent(5) for a complete
       list of standard event data items.

       Variables defined in EVM events and templates can be  included  in  the
       show_template by using variable specifiers, which begin with

       If a show_template is available, replaces each specifier or variable in
       the template with the value of the corresponding data item or  variable
       from  the event.	 The produced output string contains only the required
       items.  Any character in show_template is not changed in the output  if
       it  is  not  part of an item specifier or not part of a variable.  This
       method provides a convenient way to insert  literal  strings,  punctua‐
       tion, and spacing characters.

       Tabs and newlines are inserted by using and respectively.

       For  example,  a	 show_template of causes each event read by to be dis‐
       played as a single line of text.	 The line of text is comprised of  the
       date and time, the priority of the event enclosed in brackets, and then
       the event name.

       The output appears as follows:

       The special show_template specifier is replaced with the	 event's  for‐
       matted  text.  The formatted text is produced by taking the format data
       item. Then,  any	 embedded  variable  specifiers	 (beginning  with  are
       replaced with the corresponding variable value, and any data item spec‐
       ifiers are replaced with the corresponding data item.

       For example, the show_template of results in  the  following  style  of

       Items  specified	 by  in	 the show_template that are not present in the
       event are replaced by the hyphen character

       An or character not associated with  a  valid  item  name  or  variable
       value, respectively, is unchanged in the output.	 If it is necessary to
       have an or sequence in the output, the and characters should be escaped
       with backslashes

       If  the	option	is specified, each formatted line is prefixed with the
       event's timestamp value in a format specified by timespec.   The	 time‐
       spec  can be any string containing specifiers as defined in the section
       of the date(1) manpage.	For example, the string yields	the  date  and
       time  in	 format with a trailing space character separating it from the
       rest of the line.   Use	this  option  instead  of  specifying  in  the
       show_template to produce a timestamp in any desired format.

       The  option  can	 be used to specify an EVM filter string, to limit the
       events that are passed through If this option is used, only events that
       match the filter_expr are output.  See the EvmFilter(5) manpage for the
       filter syntax.

       The option can be used in combination with the and options to make  act
       as  a  filter,  reading	a stream of events and writing only those that
       meet the selection criteria specified by the other options.  Events are
       output as raw EVM events, so output cannot be directed to a terminal if
       this option is used.

       The option can be used to extract one or more data  items  or  variable
       values  from  an	 event	stream	in  their native binary formats.  This
       option is particularly useful for producing a  data  file  from	events
       that contain the required data in variables.

       Binary values are written to the output file in the size appropriate to
       their types -- for example, if a variable named	in  the	 item_list  is
       present	in  an event and has a type of 8 bytes of binary data are out‐
       put.  String values are output as arbitrary-length  character  strings,
       terminated by a single null byte.  If a data item or variable specified
       in the item_list is not present in an event, nothing is written to  the
       output,	and no error is reported.  Output cannot be directed to a ter‐
       minal if the option is used.

       Uses		   config_file	as  the	 channel  configuration	  file
			   instead of the default file, The channel configura‐
			   tion file is read when the or the option is used.

       Outputs each event as a full multiline detailed display, using the
			   details function defined for the event in the chan‐
			   nel configuration file

       Outputs each event as a multiline dump of the contents of the event.
			   This	 format	 does  not include explanation text or
			   any additional details about the event.

       Does not format events, but outputs each event as a raw (binary) event.
			   This option results in an error if is directed to a
			   terminal device.

       Outputs	the  specified	data  items or variable values in their native
			   ASCII or binary,  as	 appropriate.	The  item_list
			   must	 specify  one or more standard data items (for
			   example, or variables (for  example,	 my_variable),
			   separated  by  commas  or tab characters.  The list
			   must be enclosed in single quotes if or tab charac‐
			   ters	 are used, to protect them from interpretation
			   by the shell.  See the section for details  of  the
			   output produced by this option.

       Outputs the explanation text for the event.
			   The	explanation  is obtained using the explanation
			   function (defined for the event in the channel con‐
			   figuration file

       Outputs each event as a formatted line using the specified
			   show_template.   If this option is used in conjunc‐
			   tion with or the formatted  line  is	 output	 first
			   followed by the multiline output resulting from the
			   other option.

       Outputs the event's timestamp value at the start of each formatted text
			   line using timespec as a template for the timestamp
			   format.  See the section for details of timespec.

       Outputs only events that match the
			   filter_expr.	  See the EvmFilter(5) manpage for the
			   filter syntax.

       Echoes any specified filter string to
			   and terminates.  If the filter specified  with  the
			   option  refers  to  a  stored filter, the filter is
			   expanded before being displayed.  This  feature  is
			   useful  for	retrieving filter strings from a file.
			   This option cannot be used in conjunction with  any
			   other output format control option.

       Skips the first	   skip_count  events  from  the  input	 stream before
			   beginning output.  If skip_count exceeds the number
			   of  events  in  the input stream, no output is pro‐

       Stops producing output after
			   show_count events have been output.	If  show_count
			   exceeds  the	 number of events in the input stream,
			   outputs all events.

       filename	 Reads events from file filename.  If filename is omitted,  or
		 is specified as events are read from

       1. The and options should not be used when output is sent indirectly to
	  a terminal device, such as piping the output of the command  to  the

       2. The  and  commands  can be made to run automatically by use of their
	  options.  See evmget(1) and evmwatch(1) for more information.

   Environment Variables
       The following environment variable affects the execution of

       This variable contains a string formatted as described for a
		 show_template.	 If the and options are omitted, the string is
		 used as the show_template for output.

       The following exit values are returned:

       Successful completion.
       An error occurred.

       ·  In  the  following  example,	all available events are retrieved and
	  piped to for formatting.  The show_template causes the events to  be
	  displayed  as	 timestamp  value,  followed  by  the event's priority
	  enclosed in brackets, followed by the formatted event message.

       ·  This example displays events in the same way as the  previous	 exam‐
	  ple,	but the show_template is specified in an environment variable,
	  simplifying the command.

       ·  The following example retrieves all available events using and sorts
	  them	into  a	 file.	 In  the command, the option requests that the
	  events be sorted into timestamp order, and the hyphen	 character  at
	  the  end  of	the  sort  specification indicates that the sort order
	  should be descending.	  This	results	 in  the  most	recent	events
	  appearing  first.   The command is then used to display full details
	  (indicated by the option) of the first  five	(most  recent)	events
	  from the file.

       ·  The  following  example  displays the value of the filter named from
	  the supplied filter file.  Refer to evmfilterfile(4) for more infor‐
	  mation about filter files.

       ·  The  following  example  retrieves all events and displays them with
	  the timestamp in the form followed by the priority and the formatted
	  message.   See  date(1)  for	details	 of  the  timestamp formatting

       ·  The following example watches for events of priority 600 or greater,
	  and  mails  them  in	detailed display format to user with a subject
	  line that identifies the event.  In the command, the option produces
	  the  subject	line  as  the first line of the output, and the option
	  causes to follow the subject line with a  detailed  display  of  the
	  event.   The command uses the line beginning with as the subject for
	  the mail message.

       ·  The following example reads raw EVM events from the file and	writes
	  the  events  that  have  a priority of 500 or greater to Because the
	  option is specified, the output file contains raw EVM events.

       ·  The following example uses the option to request a list of all event
	  templates from the EVM daemon, and then uses to display the name and
	  priority of each template, followed by its  explanation  text.   See
	  evmtemplate(4) for details of event templates.

       The command rejects attempts to output raw events to a terminal device.

       Location of the EVM channel configuration file

       date(1), evmget(1), evminfo(1), evmpost(1), evmsort(1), evmwatch(1).


       evmchannel.conf(4), evmfilterfile(4), evmtemplate(4).

   Event Management

   EVM Events

   Event Filter


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