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Full Discussion: Truncate Log files
Top Forums Shell Programming and Scripting Truncate Log files Post 302370515 by sysrenan on Wednesday 11th of November 2009 04:59:34 PM
Old 11-11-2009
I've done this little script to delete lines from a file without moving it to a temporary file then moving back, it will start deleting line from line 1 to whatever % you choose.
name: truncade
Code:
#!/bin/bash
# sysrenan - www.sysrenan.com
# delete a percent of line within a file

if [ "$#" -eq 1 ]
then

    	SRC="$1"
        TOTAL=$(cat $SRC | wc -l)

        if [ "$?" -eq 0 ]
        then
            	echo "This log has $TOTAL lines";
                echo "Enter the % of lines you want to delete:";
                read linestodelete;

                DEL=$(($TOTAL * $linestodelete / 100));
                /bin/sed -i 1,$DEL\d $SRC;
        else
            	echo "Invalid file";
                exit 1;
        fi
else
    	echo "Incorrect number of arguments";
        echo "Usage: ./truncade <logfile>";
fi

hope it helps, let me know
 

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LEARN ABOUT REDHAT

wbemlogviewer

wbemlogviewer(1M)														 wbemlogviewer(1M)

NAME

       wbemlogviewer - start WBEM Log Viewer

SYNOPSIS

       /usr/sadm/bin/wbemlogviewer

       The  wbemlogviewer  utility  starts  the  WBEM  Log  Viewer graphical user interface, which enables administrators to view and maintain log
       records created by WBEM clients and providers. The WBEM Log Viewer displays a Login dialog box. You must log in as  root  or  a	user  with
       write access to the rootcimv2 namespace to view and maintain log files. Namespaces are described in wbemadmin(1M).

       Log events can have three severity levels.

	 o  Errors

	 o  Warnings

	 o  Informational

       The  WBEM  log file is created in the /var/sadm/wbem/log directory, with the name wbem_log. The first time the log file is backed up, it is
       renamed wbem_log.1, and a new wbem_log file is created. Each succeeding time the wbem_log file is backed up, the file extension	number	of
       each  backup log file is increased by 1, and the oldest backup log file is removed if the limit, which in turn is specified in the log ser-
       vice settings, on the number of logfiles is exceeded. Older backup files have higher file extension numbers than more recent backup files.

       The log file is renamed with a .1 file extension and saved when one of the following two conditions occur:

	 o  The current file reaches the specified file size limit.

	 o  A WBEM client application uses the clearLog() method in the Solaris_LogService class to clear the current log file.

	 o  A WBEM client application uses the clearLog() method in the Solaris_LogService class to clear the current log file.

	 o  A user chooses Action->Back Up Now in the Log Viewer application.

       Help is displayed in the left panel of each dialog box. Context help is not displayed in the main Log Viewer window.

       The WBEM Log Viewer is not the tool for a distributed environment. It is used for local administration.

       The WBEM Log Viewer allows you to perform the following tasks:

       View the logs

       Set properties of log fiClick Action->Log File Settings to specify log file parameters and the log file directory.

       Back up a log file      Click Action->Back Up Now to back up and close the current log file and start a new log file.

       Open historical log fileClick Action->Open Log File to open a backed-up log file.

       Delete an old log file  Open the file and then click Action->Delete Log File. You can only delete backed-up log files.

       View log record details Double-click a log entry or click View->Log Entry Details to display the details of a log record.

       Sort the logs	       Click View->Sort By to sort displayed entries. You can also click any column heading to sort the list. By  default,
			       the log entries are displayed in reverse chronological order (new logs first).

EXIT STATUS

       The wbemlogviewer utility terminates with exit status 0.

       /var/sadm/wbem/log/wbem_log

	   WBEM log file

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWwbcor 		   |
       +-----------------------------+-----------------------------+

       wbemadmin(1M), init.wbem(1M), mofcomp(1M), attributes(5)

								    3 Jan 2000							 wbemlogviewer(1M)
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