syslogd man page on 4.4BSD

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SYSLOGD(8)							    SYSLOGD(8)

       syslogd - log systems messages

       syslogd [ -fconfigfile ] [ -mmarkinterval ] [ -d ]

       Syslogd	reads  and  logs messages into a set of files described by the
       configuration file /etc/syslog.conf.  Each message is one line.	A mes‐
       sage can contain a priority code, marked by a number in angle braces at
       the beginning of the line.  Priorities are defined  in  <sys/syslog.h>.
       Syslogd	reads  from  the UNIX domain socket /dev/log, from an Internet
       domain socket specified in /etc/services, and from the  special	device
       /dev/klog (to read kernel messages).

       Syslogd	configures when it starts up and whenever it receives a hangup
       signal.	Lines in the configuration file have a selector	 to  determine
       the  message  priorities	 to which the line applies and an action.  The
       action field are separated from the selector by one or more tabs.

       Selectors are semicolon separated lists of priority  specifiers.	  Each
       priority	 has  a facility describing the part of the system that gener‐
       ated the message, a dot, and a level indicating	the  severity  of  the
       message.	  Symbolic names may be used.  An asterisk selects all facili‐
       ties.  All messages of the specified level or higher (greater severity)
       are  selected.	More than one facility may be selected using commas to
       separate them.  For example:


       Selects all facilities at the emerg  level  and	the  mail  and	daemon
       facilities at the crit level.

       Known  facilities  and levels recognized by syslogd are those listed in
       syslog(3)  without  the	leading	 ``LOG_''.   The  additional  facility
       ``mark'' has a message at priority LOG_INFO sent to it every 20 minutes
       (this may be changed with the -m flag).	The ``mark'' facility  is  not
       enabled by a facility field containing an asterisk.  The level ``none''
       may be used to disable a particular facility.  For example,


       Sends all messages except mail messages to the selected file.

       The second part of each line describes  where  the  message  is	to  be
       logged if this line is selected.	 There are four forms:

       ·  A  filename  (beginning  with	 a  leading  slash).  The file will be
	  opened in append mode.

       ·  A hostname preceeded by an at sign (``@'').  Selected	 messages  are
	  forwarded to the syslogd on the named host.

       ·  A  comma  separated list of users.  Selected messages are written to
	  those users if they are logged in.

       ·  An asterisk.	Selected messages are written to all logged-in users.

       Blank lines and lines beginning with `#' are ignored.

       For example, the configuration file:

	   kern,mark.debug	  /dev/console
	   *.notice;	  /var/log/maillog
	   *.crit		  /var/log/critical
	   kern.err		  @ucbarpa
	   *.emerg		  *
	   *.alert		  eric,kridle
	   *.alert;auth.warning	  ralph

       logs all kernel messages and 20 minute marks onto the  system  console,
       all  notice  (or	 higher)  level	 messages and all mail system messages
       except debug messages into the file /var/log/maillog, and all  critical
       messages	 into  /var/log/critical; kernel messages of error severity or
       higher are forwarded to ucbarpa.	 All users will	 be  informed  of  any
       emergency  messages, the users ``eric'' and ``kridle'' will be informed
       of any alert messages, and the user ``ralph'' will be informed  of  any
       alert  message,	or any warning message (or higher) from the authoriza‐
       tion system.

       The flags are:

       -f   Specify an alternate configuration file.

       -m   Select the number of minutes between mark messages.

       -d   Turn on debugging.

       Syslogd creates the file /var/run/, if possible, containing a
       single line with its process id.	 This can be used to kill or reconfig‐
       ure syslogd.

       To bring syslogd down, it should be sent a terminate signal (e.g.  kill
       `cat /var/run/`).

       /etc/syslog.conf	   the configuration file
       /var/run/ the process id
       /dev/log		   Name of the UNIX domain datagram log socket
       /dev/klog	   The kernel log device

       logger(1), syslog(3)

4.2 Berkeley Distribution	 June 27, 1990			    SYSLOGD(8)

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