change device protection upon
fbtab file contains lines which
specify how the permissions and ownership of various system files should be
changed based on the user's login device name.
Comments start with a ‘
and extend to the end of the line. Blank lines or lines with only a comment
All other lines consist of three fields delimited by whitespace.
- Login Device
- The device you have logged in on (e.g., “/dev/ttyv0”).
- File Permission
- An octal permission number (0600), as used by chmod(2).
- Other devices
- The final field is a colon (‘
:’) delimited list of devices (e.g., “/dev/console:/dev/fd0a”). All device names are absolute paths. A path that ends in “/*” refers to all directory entries except “.” and “..”.
fbtab file is used by
chown(2) the specified files to the user who has performed a login.
Additionally, chmod(2) is used to set the devices to the specified
permission. When a user logs out,
init(8) is responsible for performing the inverse operation, which
results in the files once again belonging to root.
login(1), login_fbtab(3), init(8)
Guido van Rooij