/etc/default/rcS contains information in the following format:
The following options can be set, the defaults values are shown:
On bootup the files in /tmp will be cleaned up if their modification time was more than TMPTIME days ago. A value of zero means that all files are removed regardless of age. If you don't want the system to clean /tmp set TMPTIME to a large value like 9125 (25 years).
Setting this to yes causes init to spawn a sulogin on the console as one of the first things in the boot process. If the administrator does not login, the sulogin will timeout after 30 seconds and the boot process will continue.
Normally the system will not let anyone login until the boot process is complete and and the system has come up completely in the default runlevel (usually level 2). However theoretically it's possible to login a bit earlier, as soon as /usr/sbin/inetd is started. The default value of no prevents this, setting it to yes allows it.
This is used to interpret the system (BIOS) clock. If this option is set to no the system clock is supposed to be set at local time. If this option is set to yes the system clock is supposed to be set at UTC (Universal Time, a.k.a. GMT).
Setting this option to no will make the bootup a bit less verbose.
At boot time the system edits the first line of the file /etc/motd and replaces it with the output from the command uname -a. Setting this to no prohibits that.