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Full Discussion: Gzip behavior on open files?
Top Forums Shell Programming and Scripting Gzip behavior on open files? Post 302798199 by hanson44 on Wednesday 24th of April 2013 03:00:30 AM
Old 04-24-2013
I agree there is a potential problem with renaming the logfile, that maybe some data might be lost or something go wrong with the process of writing to the logfile. I was just trying to suggest something as an alternative to blanking out the file, but I would do neither.

What if you just gzip the file, and let it keep growing? You will have a 100% sure valid zip file, and you are 100% sure the log file will not be damaged, and you will be 100% sure that no data are lost. It's blanking out the log file or renaming the log file that introduces the data loss potential.

The zip file might fail to collect all the data in the log file, but it doesn't matter. The data are still in the log file. The zip file is complete as of some time point.

Maybe there is some reason you need to blank out (truncate) the log file?
 

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GZFORCE(1)						      General Commands Manual							GZFORCE(1)

NAME
gzforce - force a '.gz' extension on all gzip files SYNOPSIS
gzforce [ name ... ] DESCRIPTION
gzforce forces a .gz extension on all gzip files so that gzip will not compress them twice. This can be useful for files with names trun- cated after a file transfer. On systems with a 14 char limitation on file names, the original name is truncated to make room for the .gz suffix. For example, 12345678901234 is renamed to 12345678901.gz. A file name such as foo.tgz is left intact. SEE ALSO
gzip(1), gznew(1), gzmore(1), gzgrep(1), gzdiff(1), gzexe(1) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgzip | +--------------------+-----------------+ |Interface Stability | External | +--------------------+-----------------+ NOTES
Source for gzip is available in the SUNWgzipS package. GZFORCE(1)
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