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Creating conditional symlink

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Operating Systems Linux Ubuntu Creating conditional symlink
# 1  
Old 12-03-2012
Creating conditional symlink
Hi All,
Is there any way to create a symlink that will point to last 1000 line of a log file. My symlink will always point to "tail -1000 logfile".

This can be achieved by writing a script and scheduling with high frequency, but I am looking for some other alternatives.

Please let me know if there is any way to do so.

Thanks in advance.
# 2  
Old 12-03-2012
A symlink has to point to a physical file if you want it to return a file descriptor on open.
So, what you are asking is interesting but does not make sense to me.

Rather than you telling us how to do it, please tell us what you are trying to accomplish.


Do you know about
Code:
tail -f

This User Gave Thanks to jim mcnamara For This Post:
sussus2326
# 3  
Old 12-03-2012
I am looking for a way to create a symlink which will point to last 1000 lines of a logfile. The link will dynamically point to the last 1000 lines always.

My log file is huge and I am only interested to see what happened recently.
# 4  
Old 12-03-2012
Use an alias.
This User Gave Thanks to RudiC For This Post:
sussus2326
# 5  
Old 12-03-2012
Thanks.

Alias will help to get the last 1000 lines dynamically. I am planning to expose this file using web server for external users to read. In this case will alias be helpful?

If there is any other approach please suggest.
# 6  
Old 12-03-2012
May a named pipe?

Code:
Create a named pipe:
mkfifo /tmp/watch_log

Point the tail command to it and background it:
tail -f -n1000 logfile > /tmp/watch_log &

Watch it using the cat command:
cat /tmp/watch_log

This User Gave Thanks to in2nix4life For This Post:
sussus2326
# 7  
Old 12-03-2012
A symlink points to a file. It can't do anything else.
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