rcS - variables that affect the behavior of boot scripts
file contains variable settings in POSIX format:
Only one assignment is allowed per line. Comments (starting with '#') are also
NOTE: This file is ignored when systemd is used as init system.
The following variables can be set.
- On boot the files in /tmp will be deleted if their
modification time, file status time and access time are all at least
TMPTIME days ago. A value of 0 means that files are removed regardless of
age. If you don't want the system to clean /tmp then set TMPTIME to a
negative value (e.g., -1) or to the word infinite.
- Setting this to yes causes init to spawn a
sulogin on the console early in the boot process. If the
administrator does not login then the sulogin session will time out after
30 seconds and the boot process will continue.
- Normally the system will not let non-root users log in
until the boot process is complete and the system has finished switching
to the default runlevel (usually level 2). However, in theory it is safe
to log in a bit earlier, namely, as soon as inetd has started.
Setting the variable to no allows earlier login; setting the
variable to yes prevents it.
Some details: The DELAYLOGIN variable controls whether or not the
file /run/nologin is created during the boot process and deleted at
the end of it. The login(1) program refuses to allow non-root
logins so long as /run/nologin exists. If you set the variable to
no then it is advisable to ensure that /run/nologin does not
- Setting this option to no (in lower case) will make
the boot process a bit less verbose. Setting this option to yes
will make the boot process a bit more verbose.
- When the root and all other file systems are checked,
fsck is invoked with the -a option which means
"autorepair". If there are major inconsistencies then the fsck
process will bail out. The system will print a message asking the
administrator to repair the file system manually and will present a root
shell prompt (actually a sulogin prompt) on the console. Setting
this option to yes causes the fsck commands to be run with the
-y option instead of the -a option. This will tell fsck
always to repair the file systems without asking for permission.
- Set this to 'no' to disable asynchronous mounting of
network drives when the network interfaces are mounted, and instead do it
only once when the machine boots. The default is 'yes'. It is useful to
disable this on machines where the root file system is NFS, until ifup
from ifupdown works properly in such setup.
variables are no longer used.
variables have been moved
to /etc/default/tmpfs; RAMSHM and RAMTMP settings in rcS are used (if set) for
backward compatibility, but will be overridden by settings enabled in
/etc/default/tmpfs. See tmpfs(5)
for further details. The settings are
not automatically migrated to /etc/default/tmpfs. Please update
/etc/default/tmpfs appropriately. The UTC setting is replaced by the UTC or
LOCAL setting in /etc/adjtime, and should have been migrated automatically.
for further details on configuring
the system clock.
Miquel van Smoorenburg <email@example.com> Roger Leigh