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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.?
# 8  
Old 07-09-2013
Does the crontab change what latest.log points to?
# 9  
Old 07-09-2013
latest.log points to new file

Code:
latest.log -> /usr/home/TF/log/CybertonTransaction.20130710-03.log

after crontab run
Code:
latest.log -> /usr/home/TF/log/CybertonTransaction.20130710-04.log

# 10  
Old 07-09-2013
the tail -F process seems to not let go of the file it was already tailing so creating a new link will not work ... you may need to kill the tail process first prior to creating the new link ...

but if you have to do that, it would be much cleaner and much easier to understand if you tailed the latest file identified by its file name (i.e., CybertonTransaction.20130710-04.log) instead of the generic latest.log ...

Code:
kill -9 $(ps -ef | awk '$0 ~ /tail/ {print $2}')   # <-- assumes only 1 process has "tail" string in command line

tail -f "$(ls -t /usr/home/TF/log/ | head -n 1)"

# 11  
Old 07-10-2013
you can simply try this
Code:
file=`"date +/files/CybertonTransaction.%Y%m%d-%H.log"` 
   
/files/   this is your directory 

tail -f $file

try it in a crontab
# 12  
Old 07-11-2013
Quote:
Originally Posted by Just Ice
the tail -F process seems to not let go of the file it was already tailing
It does, I tested it. If it doesn't, -F is broken on your system.

There'd be no point having a 'follow symlinks' option without it, after all... The OS does that perfectly well all by itself.
# 13  
Old 07-11-2013
Quote:
Originally Posted by Corona688
It does, I tested it. If it doesn't, -F is broken on your system.

There'd be no point having a 'follow symlinks' option without it, after all... The OS does that perfectly well all by itself.
@ooilinlove - on the assumption that the second to the last log is not being updated any longer as soon as the latest log is started ... test the lines below in the order listed on the command line and see what happens ...
Code:
ln -sf $last_file latest.log   # <-- change $last_file to actual file name of 2nd to the last log 

tail -F latest.log

ln -sf $latest_file latest.log # <-- change $latest_file to actual file name of latest log; do this 
                               # on a separate terminal window so you see if tail -F is still working

you should not see any movement on the tail -F run after the first symlink and see changes coming through after the second symlink ... if you still do not see anything with tail -F after second the symlink, append a new readable line to the last log (i.e., date >> $last_log) in a separate window and verify that it does not show on the tail -F window ... if the new line does show up, have your sysadmin troubleshoot ... if it does not, post your complete script ...
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