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
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