How to force file permission of new files under certain directory

[yyghp]

I have a directory called /logs, which contains logs of application running by different users, like app.log.1, app.log.2, ...etc. no matter which user runs that application, such user can write/extend logs to the current log file, and will create a new log when the log file is filled up to 1MB. But the problem is that the application generate the log file with "-rw-r--r--" by default, with the owner who first creates that log file, then others can't extend that log file because no write permission.
How can I force the application generate the file with permission like "-rw-rw-rw-" ? or How can I force all new files to be "-rw-rw-rw-" under a certain directory?
Can ACL help?
Thanks!

[Stuart Browne]

I'd start by trying to set the umask prior to executing the application.

How is the application being launched? From a .profile?

If so, prior to the execution of the application, put a 'umask 002' (which should create files as -rw-rw-r--).

I'd couple this with setting the directory sgid (chmod g+s /logs), and setting the correct group on '/logs'.

[xyko_1]

Hi yyghp,

the application that creates the file (log) may chmod just after creating it. I thing that's the easier way.

regards,
xyko

[xyko_1]

Hi Stuart and yyghp,

setting the umask solves the problem but it brings another one. umask will affect all files and directories during the shell session, not only the desired /log directory and for the scope of the application. So, one has to remember to set umask back to the defaults just after the application has finished.

regards,
xyko

[Ross Minkov]

> How can I force the application generate the file with permission like "-rw-rw-rw-" ?

One more thing -- log files writable by anybody... not a good idea.

Regards,
Ross