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Searching for a string in a log file with little movement

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Top Forums Shell Programming and Scripting Searching for a string in a log file with little movement
# 8  
Old 03-27-2010
Comparing the string counts before and after is perfect, thanks a lot EAGL€.
# 9  
Old 03-27-2010
Quote:
Originally Posted by Moxy
Comparing the string counts before and after is perfect, thanks a lot EAGL€.
Your wellcome, but i thought about what if your logfile appends to a new one, could this solution fail?

like this: lets say when script started it considers the logfile1.bak but after a while (15 minutes) the new logfile starts and code checks strings in new logfile and occurances of string in logfile.txt could be less than the occurances of backup logfile.

logfile.txt
logfile1.bak
# 10  
Old 03-27-2010
Quote:
Originally Posted by Moxy
This problem seems to be due to the way tail -f works, it writes the last ten lines of the log file to the tmp.file even if there isn't any movement in the log file. I wonder is it possible to turn off that behavior?

Anyway I am going try get round this by using the file attributes of the error log, thanks Redhead.

Hi rdcwayx, i already null the tmp.file before the script exists.
Try below code to avoid the last ten lines in tail output.

Code:
STRING=$(awk 'NR>10 && /string/' tmp.file)

# 11  
Old 03-28-2010
Code:
tail -f -n0
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