UNIX for Dummies Questions & Answers

Hi

i have a log file, which keeps appending, i want to find "exceptions" in that log file and copy those exceptions to another file.

i am using

Code:

grep exception filename >> location where to copy

but as the file is appending, am not able to view.

i am using

Code:

tail -f command ,

pls guide me.

Everyone at the UNIX and Linux Forums gives their best effort to reply to all questions in a timely manner. For this reason, posting questions with subjects like "Urgent!" or "Emergency" and demanding a fast reply are not permitted in the regular forums.

For members who want a higher visibility to their questions, we suggest you post in the Emergency UNIX and Linux Support Forum. This forum is given a higher priority than our regular forums.

Posting a new question in the Emergency UNIX and Linux Support Forum requires forum Bits. We monitor this forum to help people with emergencies, but we do not not guarantee response time or best answers. However, we will treat your post with a higher priority and give our best efforts to help you.

If you have posted a question in the regular forum with a subject "Urgent" "Emergency" or similar idea, we will, more-than-likely, close your thread and post this reply, redirecting you to the proper forum.

Of course, you can always post a descriptive subject text, remove words like "Urgent" etc. (from your subject and post) and post in the regular forums at any time.


Thank you.

The UNIX and Linux Forums

I hope this command should work..!

Code:

grep exception filename > location where to copy

Even though the file is getting appended , write time to file will have a gap.

You can try this, assuming that the logfile already exists and that the command opens the log file for append. This will first start a process that monitors the log file. Then you can start your command that appends to the logfile

Code:

tail -f existing log file name | grep exception >> location where to copy &
command

Hi

i am using

tail -f existing log file name | grep exception >> location where to copy

but the content is not copying to the location.

ex:
tail -f logfile | grep exception >> location of file.

You can copy the file to any temp location. you can the use command as "tail -f logfile | grep -i exception >>/tmp/app.err &". Else you the copy the logfile to /tmp location , & you can view the execeptions.if your application is continously throwing the Exception to the logfile, in that case you will not be able to view the exceptions of the last minute .