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Full Discussion: Korn/bash Script to monitor a file a check for specific data
Top Forums Shell Programming and Scripting Korn/bash Script to monitor a file a check for specific data Post 302391508 by frans on Monday 1st of February 2010 02:19:27 PM
Old 02-01-2010
I've made such one but it's complex because it monitors several logfiles (auth apache/error apache/access syslog, and fail2ban) to have a snapshot of the actually banned IP's.
It makes a linecount with a grep for the interesting things at a specified rate and displays the lines in the difference count.
The problem is the logrotate because for apache/error you have also apache/error.1 and so on.
Tell us what files you want to monitor, the final usage of the script and what you've already tried.
Basics :
Code:
#!/bin/bash
OLDCOUNT=0
while :
do
    NEWS=$(grep -Fw 'denied' logfile)
    COUNT=$(echo "$NEWS" | wc -l)
    DIFF=$((COUNT-OLDCOUNT))
    if [ $DIFF -gt 0 ]
    then
        echo "$NEWS" | tail -n $DIFF
    fi
    OLDCOUNT=$COUNT
    sleep 15
done < logfile

That's the simple way (one file, no logrotate, no colour, no config file)
 

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LEARN ABOUT OSX

apache

apache(1M)						  System Administration Commands						apache(1M)

NAME

       apache - Apache hypertext transfer protocol server overview

DESCRIPTION

	apache	consists  of a main server daemon, loadable server modules, some additional support utilities, configuration files, and documenta-
       tion.

FILES

       The apache HTTPD server is integrated with Solaris.

       The following files specify the installation locations for apache:

       /etc/apache	       Contains server configuration files.

			       A newly-installed server must be manually configured before use. Typically this involves copying httpd.conf-example
			       to the httpd.conf file and making local configuration adjustments.

       /usr/apache/bin	       Contains the httpd executable as well as other utility programs.

       /usr/apache/htdocs      Contains  the  Apache  manual  in HTML format. This documentation is accessible by way of a link on the server test
			       page that gets installed upon fresh installation.

       /usr/apache/include     Contains the Apache header files, which are needed for building various optional server extensions with apxs(8)

       /usr/apache/jserv       Contains documention for the mod_jserv java servlet module. Documention can be read with a web  browser	using  the
			       url:

			       file:/usr/apache/jserv/docs/index.html

       /usr/apache/libexec     Contains loadable modules (DSOs) supplied with the server. Any modules which are added using apxs(8)are also copied
			       into this directory.

       /usr/apache/man	       Contains man pages for the server, utility programs, and mod_perl.

			       Add this directory to your MANPATH to read the Apache man pages. See NOTES.

       /usr/apache/perl5       Contains the modules and library files used by the mod_perl extension to Apache.

       /var/apache/cgi-bin     Default location for the CGI scripts.

			       This can be changed by altering the httpd.conf file and restarting the server.

       /var/apache/htdocs      Default document root.

			       This can be changed by altering the httpd.conf file and restarting the server.

       /var/apache/icons       Icons used by the server.

			       This normally shouldn't need to be changed.

       /var/apache/logs        Contains server log files.

			       The formats, names, and locations of the files in this directory can be altered by various configuration directives
			       in the httpd.conf file.

       /var/apache/proxy       Directory used to cache pages if the caching feature of mod_proxy is enabled in the httpd.conf file.

			       The location of the cache can also be changed by changing the proxy configuration in the httpd.conf file.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWapchr 		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWapchu 		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWapchd 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

       http://www.apache.org

NOTES

       In addition to the documentation and man pages included with Solaris, more information is available at http://www.apache.org

       The  Apache  man pages are provided with the programming modules. To view the manual pages for the Apache modules with the man command, add
       /usr/apache/man to the MANPATH environment  variable. See man(1) for  more information. Running catman(1M) on the Apache  manual  pages	is
       not supported.

SunOS 5.10							    8 Aug 2000								apache(1M)
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