问题
I want to make 002 the system-wide umask for all users (in Ubuntu). I managed to do so for all regular users using the instructions provided by @ephemient (From this post, thanks for that!). However I got 2 more problems.
Firstly, when sudoing, the root user seems to follow it's own settings, making files with the permissions 644 (instead of 664).
Secondly, the apache user (www-data) also seems to follow it's own settings (the same used by root?), making files with the permissions 644 (instead of 664). I don't like to put umask 002 in /etc/apache2/envvars, I'd rather change the setting assigning the 002 umask to apache in the first place.
How can I tackle those last 2 issues?
回答1:
I solved my own problems.
For the sudo permissions, I executed sudo visudo and added the line Defaults umask = 0002 to the end.
For the Apache user, I added the line umask 0002 to the end of the /etc/apache2/envvars (I couldn't find any better solution).
来源：https://stackoverflow.com/questions/22813873/linux-umask-for-sudo-and-apache