660 permissions.
The file has the format:
- [-]<device regex> <uid>:<gid> <permissions>
+ [-][envmatch]<device regex> <uid>:<gid> <permissions>
or
- @<maj[,min1[-min2]]> <uid>:<gid> <permissions>
+ [envmatch]@<maj[,min1[-min2]]> <uid>:<gid> <permissions>
or
$envvar=<regex> <uid>:<gid> <permissions>