Summary: Grep, Sed, Awk - timestamp range for those non "fluent"

Hi;
     Thanks for those who replied. This is what I find out to be the most flexible and easy to use (with inspiration from Ragnar Moller's suggestion):
   
  $ sort -k 3b,3b messages|grep -n "MAY 30"|sed -n '/11:00:00/,/12:00:00/ p'
   
  john.benjamins@sympatico.ca suggestion:
  To get all the messages from 00:00:00 up to 11:59:59 (but not 12:00:00
exactly) use:

$ egrep 'May 30 (0[0-9]|1[01]):[0-5][0-9]:[0-5][0-9] ' messages

  daniel.denes@bankgesellschaft.de suggestion:
  add this to your grep:
| nawk '{daysec = 60*60*substr($3, 0, 2)+60*substr($3, 4, 2)+substr($3, 
7); if (daysec <=43200) print $0;}'

   
  Regards,
  TEH
    Hi;
Following this summary from Ragnar Moller, may experts out there advise how do I grep syslog messages with format of:

MAY 30 01:12:16 ...

for messages with timestamp between 00:00:00 to 12:00:00? What I am looking for is something like:
$ grep "MAY 30" messages| 

Thank you for any insight and advice. I will summarize.

Regards,
TEH

"Ragnar Moller (MA/EAF)" wrote:
> I got a lot of answers. I had a job to do so I triggered on and tried
> the first one which almost evolved the "unproved" by Stephen.Grund
> (but step by step).
> I think they're really worth sharing for those of us who aren't yet
> "fluent" in Unix.
> Like I said I only tried sed, but I certainly will take the time to
> try out the other ones because I'll be needing a higher performing and
> table solution next round.
>
> Here are the answers:
> Use sed by majority
> Cat file | -n '/cecilia/,/frederic/ p'
> Use Awk 25%
> awk '/from/,/to/' filename
> awk '/cecilia/,/frederic/ { print }'
> Unproved by Stephen Grund
> set from=`grep -n fromfirst filename | head -1 | awk -F: '{print $1}'`
> set last=`grep -n tolast filename | tail -1 | awk -F: '{print $1}'`
> awk '(NR>=from)&&(NR<=last)' filename
> This is exactly what perl was developed for. Pretty simple to do.
> Kristopher Briscoe
> http://freshmeat.net/projects/cgrep James Noyes
> cgrep provides many of the features of grep, egrep, and fgrep with
> enhanced performance along with many additional features. One of the
> most important features is the ability to output the context
> (surrounding lines) of the matching lines. The context window may be
> specified as a constant number of lines before and after the matching
> lines, by specifying beginning and ending delimiters, or various
> combinations thereof.
>
> Use a shell script Dwight Brewer
>
> #!/usr/bin/sh
>
> inbetween=false
> echo "" > newfile
>
> cat data |while read line
> do
> start_check=`echo $line | grep cecilia`
> if [ "$start_check" ]
> then
> ## we found start line containing cecilia
> inbetween=true
> fi
>
> if [ "$inbetween" = "true" ]
> then
> echo $line >> newfile
> end_check=`echo $line | grep frederic`
> if [ "$end_check" ]
> then
> ## we found end line containing frederic
> inbetween=false
> fi
> fi
> done
>
>
> Use Perl by Ric Anderson
>
> Depending on how much you need to do, awk or perl will handle this
> task. Something like
> awk -f awkscript < your_file
> where awkscript contains
> { if($0 ~ /cecilia/) {
> print $0;flag=1;
> }
> else {
> if(flag == 1) {
> print $0;
> if($0 ~ /frederic/) {
> exit(0);
> }
> }
> }
> }
> will print all the information beginning with a line containing
> cecilia and ending with a line containing frederic. Note the match is
> case sensitive.
> Minor edits to the logic here would allow suppressing the cecilia and
> frederick lines and only displaying the information between those
> points.
>
> Perl provides more powerful pattern matching, and a lot of other
> useful features that make it a better choice than awk for more complex
> tasks.
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