Hai,
I have a program which updates the result in a log file, as the program runs 24*7,the size of log file keeps on increasing.
Can you help me with a shell command which will clear the content of a log file in use.
1) I tried tail -10 logfile > logfile ( the content is not changed )
2) > logfile ( no change in filesize )
3) echo -n >logfile ( no change in filesize )
Coolbhai,
If the way your application was designed, it is appending to the file
each microsecond, you must take the risk of loosing some data whenever
you refresh the log file.
If you are appending, then if the file does not exist, the append
will create it.
Here is one possible solution if you want to save the file:
If you do not want to save:
result : no change in file size ,for a fraction of a second,file size droped to zero but again regained its original size.
I have a wierd suggestions:
I know the 'fuser' of that particluar file, is there any way by which that I transfer 'fuser' to temp-file and clear the logfile and bring the fuser back to actual logfile.
NB : Even if I rename the file,the renamed file keeps on updating.So process Id has some role in this process.
Assuming that the author of the code writing the never-ending file knows even a little bit about unix:
1. For this process there is a configuration file, which names the output logfile.
2. The process "reconfigures" itself when it receives a SIGHUP signal,
by re-reading the config file, and if the name of the logfile changed, then close the old one, open the new one.
This is pretty much UNIX standard for a never-ending log writer program.
Hi,
I have a file with 15 fields seperated by '|'. The requirement is to clear the last 5 characters of the 14th field. modifications should be done to the original file .
Can some one help me in sorting this out. (2 Replies)
proc get_view_rel_str { } {
set cc_view :] end]]
puts $cc_view
set a
puts $a
set a end]]
puts $a
set a
puts $a
set a
puts $a
set a
puts $a
}
get_view_rel_str
this is a script in tcl with clearcase view (1 Reply)
Hi,
I have a script which will use an input.txt file as an input file.
I am providing data to this input file in the script and once the script is executed, I want to clear all the contents of this file as during the second time use of this script, I'll be appending the data in this input... (5 Replies)
Dear Friends ,
From 'last' or 'lastlog' command , I can get the last login informations of the users . now as a system admin , If I want to delete the log information from this 'last' 'lastog' command , then is it possible to do ?
plz inform ... ... (1 Reply)
Hello,
I have a script which creates a certain text file.
Whenever I call it, I need to recreate this file, because I have no need in the previous content.
So I thought to remove the file every time I call the script, and that way I am sure that the previous content will not interrupt me.... (2 Replies)
I have a log file on our system which fills up with lines that have been timestamped, as follows....
03/03/2008 10:56:06:815] (ERROR) balance: continuing session to genapp02 : 18500
03/03/2008 10:56:06:820] (ERROR) balance: continuing session to genapp02 : 18500
03/03/2008 10:56:07:003]... (2 Replies)
Hello,
I want to clear or modify a line of a file. It is possible by
cat filename | sed '3d'
for example. But If I want "3" to be a variable?
I can't do sed '$var d'
Help me please
Thank you very much (1 Reply)