How does local_umask and file_open_mode work?

Question

I had some problems with the filepermissions when local users uploaded their files via vsftp to a server.

I wanted the files to have all 766 permissions. After a lot of trial and error I found out that I had to set the settings like this:

local_umask=011
file_open_mode=0777

But I don't know why this results in 766 permissions. Can anyone explain this?

Ignacio Vazquez-Abrams · Accepted Answer · 2012-06-25 22:22:33Z

up vote 2 down vote accepted

Files are created as 0777. From that, 011 is subtracted. This results in 0766.

answered Jun 25 '12 at 22:22

Ignacio Vazquez-Abrams
62k24094

Yes I got that, I know the trick. But how does this work? Why can't I set just 766? – OrangeTux Jun 25 '12 at 22:37

1 Answer