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Top Forums Shell Programming and Scripting Delete lines prior to a specific date in a log file. Post 302304309 by ahSher on Monday 6th of April 2009 05:19:15 AM
Old 04-06-2009
Hi all.

Vidhyadhar's reply did redirect all logs after Jan 1 to a new file.

But, what i want is log data after Jan 1 to remain in my original file name. My original log filename is alert.log. I want alert.log to hold only data after Jan 1.

Thanks.
 

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NEWSLOG(5)							File Formats Manual							NEWSLOG(5)

NAME
newslog - description of Usenet log files DESCRIPTION
Most log files created by Usenet programs reside in the /var/log/news directory and have a ``.log'' extension. Several versions are usu- ally kept with an additional extension such as ``.1'', ``.2'', etc. -- the higher the number, the older the log. The older versions are compressed. The scanlogs script and related utilities (see newslog(8)) are responsible for rotating and compressing these files. Some log files always have data, others only have data if there is a problem, and others are only created if a particular program is used or configuration parameter is set. The innstat script (see newslog(8)) monitors the size of all log files. The following files will only accumulate data under the direction of control.ctl(5): control.log miscctl.log newgroup.log rmgroup.log unwanted.log In order to create these files, the ``message'' and ``action'' fields of control.ctl should be chosen from the following table: Message Action Meaning all log=miscctl Log all messages by default default log=miscctl Log unknown messages newgroup doit=newgroup Create group and log message newgroup log=newgroup Log message rmgroup doit=rmgroup Remove group and log message rmgroup log=rmgroup Log message ``other'' doit=miscctl log and process the message ``other'' log=miscctl Log message Here, ``other'' refers to any other control message such as: checkgroups ihave sendme sendsys senduuname version The following is a list of log files. control.log This file maintains a count of the number of newgroup and rmgroup control messages seen for each newsgroup. The count is of the number of control messages with identical arguments, regardless if they were actually processed. All control arguments, including invalid ones, are counted. This file is updated by tally.control, which is invoked by scanlogs if either the newgroup or rmgroup logs exist. This file is not rotated. errlog This file contains the standard output and standard error of any program spawned by innd(8). The most common programs are the con- trol-message handlers found in /usr/lib/news/control. This file should be empty. Scanlogs will print the entire contents of this log file if it is non-empty. expire.log By default, when news.daily is going to expire old news articles, it writes the date to this file, followed by any output from expire(8) and the ending date. All lines but the first are indented four spaces. miscctl.log When control.ctl is configured as described above, all control messages except newgroup and rmgroup are appended to this file by writelog. There will be a summary line describing the message and the action taken, followed by the article indented by four spa- ces, and a blank line. newgroup.log When control.ctl is configured as described above, all newgroup messages are appended to this file using the same format as for mis- cctl.log. news This file logs articles received by innd. Scanlogs summarizes the rejected articles reported in this file. news.crit All critical error messages issued by innd are appended to this file via syslog(3). This log file should be empty. Scanlogs will print the entire contents of this log file if it is non-empty. You should have the following line in your syslog.conf(5) file: news.crit /var/log/news/news.crit news.err All major error messages issued by innd are appended to this file via syslog. This log file should be empty. Scanlogs will print the entire contents of this log file if it is non-empty. You should have the following line in your syslog.conf file: news.err /var/log/news/news.err news.notice All standard error messages and status messages issued by innd are appended to this file via syslog. Scanlogs uses the awk(1) script innlog.awk to summarize this file. You should have the following line in your syslog.conf file: news.notice /var/log/news/news.notice nntpsend.log The nntpsend(8) programs appends all status messages to this file. rmgroup.log When control.ctl is configured as described above, all rmgroup messages are appended to this file using the same format as for misc- ctl.log. unwanted.log This log maintains a count of the number of articles that were rejected because they were posted to newsgroups that do not exist at the local site. This file is updated by tally.unwanted and maintained in reverse numeric order (the most popular rejected group first). This file is not rotated. HISTORY
Written by Landon Curt Noll <chongo@toad.com> and Rich $alz <rsalz@uunet.uu.net> for InterNetNews. This is revision 1.6, dated 1996/09/10. SEE ALSO
control.ctl(5), ctlinnd(8), expire(8), innd(8), news.daily(8), nntpsend(8), newslog(8). NEWSLOG(5)
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