On 22/11/2011, at 9:39 AM, Tanaka Akira wrote:
> 2011/11/22 KOSAKI Motohiro <kosaki.motohiro / gmail.com>:
>> If I understand correctly, default umask don't allow world writable
>> permission. Thus, if 0664 and 0666 make a different only when users
>> changed umask intentionally. So, I don't think it's good idea to
>> ignore it.
> 
> I think the default umask is 0.
> 
> http://www.bsdlover.cn/study/UnixTree/V7/usr/sys/h/param.h.html
> #define	CMASK	0		/* default mask for file creation */
> 
> What do you mean about default umask?

The umask that almost every Unix distribution has always had in /etc/profile - which is 022.