Clear log file in use.


 
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Old 06-19-2007
Clear log file in use.

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 )

Please advice.

Thanks in advance
Coolbhai
coolbhai
 
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VK_LOGMERGE(1)						      General Commands Manual						    VK_LOGMERGE(1)

NAME
vk_logmerge - a Valgrind XML log file merger SYNOPSIS
vk_logmerge [flags and input files in any order] DESCRIPTION
vk_logmerge is a valkyrie(1) helper. Given multiple log files (in xml format) generated by multiple runs on a parallel machine, or multiple log files generated by sequential runs on a single-processor machine, for the same binary, vk_logmerge merges the log files together, sum- ming the counts of duplicates, and outputs the result to a single file. As input, vk_logmerge expects the log-files to-be-merged and/or a file containing the list of log-files to-be-merged, with each entry on a separate line. Log files can be merged from within valkyrie(1) , or use can invoke vk_logmerge directly. OPTIONS
-h Show help message -v Be verbose (more -v's give more) -t Output plain text (non-xml) -f <log_list> Obtain input files from <log_list> file (one per line) -o <writefile> File to write output to At least 1 input file must be given. If no '-o outfile' is given, writes to standard output. EXAMPLES
vk_logmerge log1.xml -f loglist.fls -o merged.xml SEE ALSO
valkyrie(1), valgrind(1). AUTHOR
vk_logmerge was written by Donna Robinson, Cerion Armour-Brown and others. This manual page was written by Hai Zaar <haizaar@haizaar.com>, for the Debian project (but may be used by others). 2009-05-02 VK_LOGMERGE(1)