Shell Programming and Scripting

awk '!h && $NF=="****************************************************************" {
    # This is the 1st line of a 4 line header.
    if(f) close(f);     # Close previous output file.
    h=1                 # Set header line number.
}
h { H[h]=$0 # Save header lines 1-4.
    if(h++==4) {
        # Set output file name from time/date stamp at end of 4th header line:
        #                   day    month   last 2 digits of year         time
        f = "output.log_" $(NF-2) $(NF-3) substr($NF,length($NF)-1) "_" $(NF-1)
        # Copy the headers to the output file.
        printf("%s\n%s\n%s\n%s\n", H[1], H[2], H[3], H[4]) > f
        h=0     # We are done with the headers for this log.
    }   
    next
}
{   print > f   # Copy remaining lines to the output file.
}' input