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How to tail -f logfile. if log file is generate every 1 HR.?

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Top Forums Shell Programming and Scripting How to tail -f logfile. if log file is generate every 1 HR.?
# 1  
Old 07-09-2013
Hammer & Screwdriver How to tail -f logfile. if log file is generate every 1 HR.?
Hello,

How to tail -f logfile. if log file is gennerate every 1 HR.
I want it works automatically all the time. never changes it by manual.
Thank

Code:
ls -trl CybertonTransaction.*
-rw-r--r--   1 autobot   robot    617071 Jul  9 00:02 CybertonTransaction.20130709-00.log
-rw-r--r--   1 autobot   robot   20728938 Jul  9 01:59 CybertonTransaction.20130709-01.log
-rw-r--r--   1 autobot   robot   3808189 Jul  9 02:59 CybertonTransaction.20130709-02.log
-rw-r--r--   1 autobot   robot   4389986 Jul  9 03:59 CybertonTransaction.20130709-03.log
-rw-r--r--   1 autobot   robot   3801622 Jul  9 04:59 CybertonTransaction.20130709-04.log
-rw-r--r--   1 autobot   robot   25008198 Jul  9 05:59 CybertonTransaction.20130709-05.log
-rw-r--r--   1 autobot   robot   59425803 Jul  9 06:59 CybertonTransaction.20130709-06.log
-rw-r--r--   1 autobot   robot   100000019 Jul  9 07:48 CybertonTransaction.20130709-07.log.1
-rw-r--r--   1 autobot   robot   8122571 Jul  9 07:59 CybertonTransaction.20130709-07.log
-rw-r--r--   1 autobot   robot   30973114 Jul  9 08:59 CybertonTransaction.20130709-08.log
-rw-r--r--   1 autobot   robot   100000022 Jul  9 09:46 CybertonTransaction.20130709-09.log.1
-rw-r--r--   1 autobot   robot   17700625 Jul  9 09:59 CybertonTransaction.20130709-09.log
-rw-r--r--   1 autobot   robot   100000088 Jul  9 10:44 CybertonTransaction.20130709-10.log.1
-rw-r--r--   1 autobot   robot   25620434 Jul  9 10:59 CybertonTransaction.20130709-10.log
-rw-r--r--   1 autobot   robot   100000128 Jul  9 11:43 CybertonTransaction.20130709-11.log.1
-rw-r--r--   1 autobot   robot   41932541 Jul  9 11:59 CybertonTransaction.20130709-11.log
-rw-r--r--   1 autobot   robot   100000094 Jul  9 12:41 CybertonTransaction.20130709-12.log.1
-rw-r--r--   1 autobot   robot   42354186 Jul  9 12:59 CybertonTransaction.20130709-12.log
-rw-r--r--   1 autobot   robot   100000052 Jul  9 13:33 CybertonTransaction.20130709-13.log.1
-rw-r--r--   1 autobot   robot   27483687 Jul  9 13:59 CybertonTransaction.20130709-13.log
-rw-r--r--   1 autobot   robot   100000124 Jul  9 14:56 CybertonTransaction.20130709-14.log.1
-rw-r--r--   1 autobot   robot   7474128 Jul  9 14:59 CybertonTransaction.20130709-14.log
-rw-r--r--   1 autobot   robot   100000118 Jul  9 15:51 CybertonTransaction.20130709-15.log.1
-rw-r--r--   1 autobot   robot   14859881 Jul  9 15:59 CybertonTransaction.20130709-15.log
-rw-r--r--   1 autobot   robot   100000033 Jul  9 16:48 CybertonTransaction.20130709-16.log.1
-rw-r--r--   1 autobot   robot   27120181 Jul  9 16:59 CybertonTransaction.20130709-16.log
-rw-r--r--   1 autobot   robot   100000143 Jul  9 17:39 CybertonTransaction.20130709-17.log.1
-rw-r--r--   1 autobot   robot   44957555 Jul  9 17:59 CybertonTransaction.20130709-17.log
-rw-r--r--   1 autobot   robot   68461482 Jul  9 18:59 CybertonTransaction.20130709-18.log
-rw-r--r--   1 autobot   robot   68803772 Jul  9 19:59 CybertonTransaction.20130709-19.log
-rw-r--r--   1 autobot   robot   70048244 Jul  9 20:59 CybertonTransaction.20130709-20.log
-rw-r--r--   1 autobot   robot   48556923 Jul  9 21:59 CybertonTransaction.20130709-21.log
-rw-r--r--   1 autobot   robot   34699326 Jul  9 22:59 CybertonTransaction.20130709-22.log
-rw-r--r--   1 autobot   robot   64397410 Jul  9 23:59 CybertonTransaction.20130709-23.log

# 2  
Old 07-09-2013
1. Have a symbolic link point to the current hour log file.
2. Put a job in the hourly cron that will re-initialise the link to the current hour log file after every hour.

As an example, lets say CybertonTransaction.log is a symlink that points to current hour log file, say CybertonTransaction.20130709-22.log. After the time changes to 23:00 hrs, the cron job should re-link CybertonTransaction.log to CybertonTransaction.20130709-23.log.

And as a tip: If you're going to view the tail-ed output for hours together, use tail -F CybertonTransaction.log - tail with uppercase 'F' the symlink.
# 3  
Old 07-09-2013
i try shell script. but not work.
Code:
nowdate=$(date '+%Y%m%d-%H.log') 
fileName=`ls -tl /usr/home/TF/log/CybertonTransaction.$nowdate |head -1  |nawk  -F" " '{print $9}'`
echo $fileName
tail -f $fileName

# 4  
Old 07-09-2013
1) That's not what he suggested.
2) You don't need 'ls -l' here, if you just do ls -t you'll have far less work to do.

Script to run every hour:

Code:
LATEST="$(ls -t /usr/home/TF/log/ | head -n 1)"
ln -sf "${LATEST}" /usr/home/TF/log/latest.log

Then you can do
Code:
tail -F /usr/home/TF/log/latest.log

and it will do the right thing.
# 5  
Old 07-09-2013
I have around 22 logs , we are using tail to search the logs ,
I have to automate 1) if the log was updated on or before 24 hours from the current time 2) if there is a string matching the word ERROR it should send mail like it has ERROR or else it should exit without sending mail . Could any1 suggest me a way but definitely TAIL command is needed to extract the log ?
# 6  
Old 07-09-2013
Please ask your separate question in your own thread. Look in the forum you wish to post in and click the Image button.
This User Gave Thanks to Corona688 For This Post:
Kalaihari
# 7  
Old 07-09-2013
Quote:
Originally Posted by Corona688
1) That's not what he suggested.
2) You don't need 'ls -l' here, if you just do ls -t you'll have far less work to do.

Script to run every hour:

Code:
LATEST="$(ls -t /usr/home/TF/log/ | head -n 1)"
ln -sf "${LATEST}" /usr/home/TF/log/latest.log

Then you can do
Code:
tail -F /usr/home/TF/log/latest.log

and it will do the right thing.
it's not work.
after contrab run. can't tail new file automantic.Smilie
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