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Old 11-19-2009, 12:45 AM   #1
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Unhappy How to search logs between two timestamps in a log file.

The requirement was to write a shell script for a cron job set for every two hours for all days.
The Script has to scan log files (*.log) for the logs posted only for the last two hours.... and append them in a new file

the log file content appears as below


INFO 21 Oct 09 15:44:48 net.oit.utils.JmsReceiver - JMS Opened
DEBUG 21 Oct 09 15:44:48 net.oit.excite.mbeans.OutBound - Registered JMS listener
INFO 21 Oct 09 15:44:48 net.oit.mbeans.Base - Status now: Running
DEBUG 21 Oct 09 15:44:48 net.oit.excite.mbeans.OutBound - Started the JMS queue status = Running
DEBUG 21 Oct 09 15:44:48 net.oit.excite.mbeans.OutBound - Completed configureAndRun.
DEBUG 23 Oct 09 12:50:14 net.oit.excite.mbeans.OutBound - Started a JMS message......
DEBUG 23 Oct 09 12:50:14 net.oit.excite.mbeans.OutBound - JobId from message


I am clueless abt how to scan/compare based on time stamp seen in above logs.
Pls Help!!!
Old 11-19-2009, 12:59 AM   #2
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Well, you could use awk or cut to grab individual fields, but honestly this is perfect for Perl. It even understands dates in that format.
Old 11-19-2009, 01:04 AM   #3
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awk 'BEGIN{
    #get time in seconds the script is run
    current = strftime("%Y:%m:%d:%H:%m:%S",now)
    print "Current date/time is: "current
    onehr = 3600 #seconds in 1 hr
    # convert "Jan" to "01" etc
    mth=date[$3] ; day=$2 ; year="20"$4    
    hr=time[1] ; min=time[2] ; sec=time[3]    
    # prepare to pass to mktime() function
    t=sprintf("%s %s %s %s %s %s" , year,mth,day,hr,min,sec)
    log_entry_time = mktime(t)
    if ( now - log_entry_time <= onehr ){
        # if less than one hour, print
        print $0
}' file
see here for another similar example.


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