Extract log FROM

overpeer · 03-13-2006, 10:31 AM

Hi all!

I want extract a portion of log file, from one timestamp to other timestamp with a shell script o a simple shell command.

This logs files have a lot of megabytes, and stand in a remote machines connected with a GPRS network to me, for it if i need read the log ... is expensive and slower get the entire log file, if i could extract a portion and compress it with gzip for download ... huummm i will be very happy

The problem is, that no all lines of log have a timestamp (yes, is a desing error ... but ... i'm only the sysadmin ... not the developer :P ), then if i filtering for example with 'cat logfile.log | grep 20060309145920 > piece.log' then the lines without timestamp dont appear

Some idea??

A lot of thanks

unSpawn · 03-13-2006, 11:00 AM

I want
Would be nice if next time you showed us what you tried. Bein admin and all you should know at least one shell to script with...

The problem is, that no all lines of log have a timestamp
...but since log is linear it doesnt matter, right? Grep for the first timestamp and note the line (-m 1 -n). Same for last line (or something from wc -l). Now feed the first and second number and the filename to sed:

Code:

sed -n ${first},${last}p $filename

and you have the chunk on stdout. Shouldnt be too hard to make a script out of that.

for example with 'cat logfile.log | grep 20060309145920
You *do not need* cat to grep: "grep searchterm filename".