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Full Discussion: extract information from a log file (last days)
Top Forums Shell Programming and Scripting extract information from a log file (last days) Post 302556778 by Corona688 on Monday 19th of September 2011 01:06:08 PM
Old 09-19-2011
Date math isn't trivial, many systems don't have easy ways to manipulate and compare dates from the shell. If you manipulate dates into YYYYMMDDHHMMSS order they can be compared alphabetically, but you can't do date arithmetic from that.

If you have GNU awk(usually found in Linux) this may be a starting point:

Code:
gawk -v EDATE="26/Oct/2002:21:02:19" 'BEGIN {
        # Set up arrays for name-to-monthnumber
        split("Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec", MON, "|");
        for(N=1; N<=12; N++) MNUM[MON[N]]=sprintf("%02d", N);

        # Split [DD/MON/YYYY:HH:MM:SS into DD MM YYYY HH MM SS stored in D[1]-D[6].
        split(EDATE, D, "[:/]");
        # Convert "YYYY MM DD HH MM SS" into epoch time, i.e. seconds since 1970
        EDATE=mktime(D[3] " " MNUM[D[2]] " " D[1] " " D[4] " " D[5] " " D[6]);
        # Starting date is 5 days earlier
        SDATE=EDATE-(60*60*24*5);
}

{
                # Need the \\[ in there to ignore the [ at the beginning of the line
                split($1, D, "[\\[:/]");
                DATE=mktime(D[4] " " MNUM[D[3]] " " D[2] " " D[5] " " D[6] " " D[7]);
                # Print the line if it falls in the correct range
                if((DATE >= SDATE) && (DATE <= EDATE)) print;
        }' < datafile

Try getting EDATE from the last lilne of the file, with tail -1
Last edited by Corona688; 09-19-2011 at 02:13 PM..
 

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LEARN ABOUT DEBIAN

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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