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grep for last 15 min of log

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# 1  
Old 03-01-2010
grep for last 15 min of log
I need help trying to grep for a error in log file for only last 15 min.

example

under /var/adm/messages i need to grep for "error 102" but only if it occured in last 15 mins?


Thanks
# 2  
Old 03-01-2010
Based on the information supplied the only way short of writing a custom program is to copy /var/adm/messages every 15 mins and check the file growth (if any) for messages containing the exact string "error 102". The file growth can be determined by recording "wc -l" but bearing in mind that negative growth signals a new log.
# 3  
Old 03-01-2010
Question Can you do a tail command?
Can you show what a tail command provides? That way someone can see the data format and help if any "tricks" with your request.
In other words, cut & paste the last 10-20 rows of the file into a follow-up message. Please remember to use code-tags around your pasted test to help with readability.
# 4  
Old 03-01-2010
This is one of those times I really wish everyone would just use epoch time, or something like it, in the logs. Then it's pretty simple.

Anyway, does it have to be in grep? Using the following as an example:

Code:
Mar  1 21:16:48 servername sshd(pam_unix)[1561]: authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=123.456.789.100

this should work, with adjustments as time passes. Obviously, it's pretty one-off... Considerable work would be needed before it would work in a script.

Code:
awk '{ month = strftime( "%b" , systime() ) ; day = strftime("%d",systime()) ; gsub("^0","",day) ; split($3,time,":" ) } ; $1 == month && $2 == day && ( time[1] == "21" || time[1] == "21" ) && ( time[2] <= 16 && time[2] > 1 ) && $0 ~ "error 102" {print}' /var/log/messages

I'm sure that there are some awk wizards here that could make no end of improvements... I'm not one, given the time constraints I have today.
# 5  
Old 03-01-2010
Quote:
Originally Posted by joeyg
Can you show what a tail command provides? That way someone can see the data format and help if any "tricks" with your request.
In other words, cut & paste the last 10-20 rows of the file into a follow-up message. Please remember to use code-tags around your pasted test to help with readability.
example

Code:
Mar  1 08:54:17 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 08:55:20 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 08:56:23 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 08:57:26 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 08:58:29 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 08:59:32 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:00:35 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:01:38 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:02:41 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:03:44 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:04:47 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:05:50 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:06:53 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:07:56 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:08:59 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:10:02 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:11:05 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host
Mar  1 09:12:08 houston1 Synergy 1.3.1: WARNING: synergyc.cpp,265: failed to connect to server: No route to host

so i wanna grep the error synergyc.cpp,265 only from the last 15 of the log.
Last edited by Scott; 03-01-2010 at 06:54 PM..
# 6  
Old 03-01-2010
Quote:
Originally Posted by shehzad_m
so i wanna grep the error synergyc.cpp,265 only from the last 15 of the log.
If you only grep the last 15 error logs (not last 15 mins error logs), you can use tail -15

Code:
grep synergyc.cpp /var/adm/messages |tail -15

# 7  
Old 03-01-2010
@shezad_m
What does an "error 102" look like in your file /var/adm/messages ?

Btw "no route to host" is a TCP/IP configuration issue on your server.
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