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Full Discussion: Creating a regex expression
Top Forums Shell Programming and Scripting Creating a regex expression Post 302416243 by bigben1220 on Monday 26th of April 2010 12:43:18 AM
Old 04-26-2010
Creating a regex expression
Good morning all!!

In my code I and looking through file /etc/syslog.congf and printing every line that has /var/log in it. I need to turn the if 9$line) into a regex code instead.

Code:
 #!/usr/bin/perl
 
  @file= 'cat /etc/syslog.conf';   //when 
 
  foreach $line (@file){
  if ($line =~ '/var/log'){
  print $line;
  }
  }

Thanks in advance for some help!! Would: if ($line =~ /?var*log?/) work?

Ben
 

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LEARN ABOUT BSD

syslogd

SYSLOGD(8)						      System Manager's Manual							SYSLOGD(8)

NAME

       syslogd - log systems messages

SYNOPSIS

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

DESCRIPTION

       Syslogd	reads  and  logs  messages into a set of files described by the configuration file /etc/syslog.conf.  Each message is one line.  A
       message can contain a priority code, marked by a number in angle braces at the beginning of the line.  Priorities are defined in  <sys/sys-
       log.h>.	 Syslogd  reads from the UNIX domain socket /dev/log, from an Internet domain socket specified in /etc/services, and from the spe-
       cial 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  deter-
       mine 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:

	    *.emerg;mail,daemon.crit

       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,

	    *.debug;mail.none

       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:

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

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

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

       o  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;mail.info	  /usr/spool/adm/syslog
	   *.crit		  /usr/adm/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  /usr/spool/adm/syslog, and all critical messages into /usr/adm/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 authorization 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/syslog.pid, if possible, containing a single line with its process id.  This  can  be	used  to  kill	or
       reconfigure syslogd.

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

FILES

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

SEE ALSO

       logger(1), syslog(3)

4.2 Berkeley Distribution					 November 16, 1996							SYSLOGD(8)
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