Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

rcs(5) [linux man page]

rcS(5)							   Debian Administrator's Manual						    rcS(5)

NAME
rcS - variables that affect the behavior of boot scripts DESCRIPTION
The /etc/default/rcS file contains variable settings in POSIX format: VAR=VAL Only one assignment is allowed per line. Comments (starting with '#') are also allowed. OPTIONS
The following variables can be set. For the default values please see /usr/share/initscripts/default.rcS. TMPTIME On boot the files in /tmp will be deleted if their modification time is more than 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. SULOGIN 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. DELAYLOGIN 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 /var/lib/initscripts/nologin is created during the boot process and deleted at the end of it. /etc/nologin is normally a symbolic link to the latter location, and the login(1) program refuses to allow non-root logins so long as (the target of) /etc/nologin exists. If you set the variable to no then it is advisable to ensure that /var/lib/initscripts/nologin does not exist. UTC This is used to govern how the hardware real time clock is interpreted when it is read (e.g., at boot time, for the purpose of set- ting the system clock) and when it is written (e.g., at shutdown). If this option is set to no then the system clock is assumed to be set to local time. If the option is set to yes then the system clock is assumed to be set to something approximating Coordinated Universal Time (UTC). (POSIX systems keep a variant of UTC, without leap seconds.) On contemporary Debian systems (although change has been requested at http://bugs.debian.org/346342), if UTC is set to no then /usr/share/zoneinfo must be readable early in the boot process. If you want to keep /usr on a separate filesystem then you must still ensure that the target of /etc/localtime points to the correct zone information file for the time zone of the time kept in your hardware real time clock. VERBOSE 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. FSCKFIX 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 sys- tems without asking for permission. NOTE
The EDITMOTD and RAMRUN variables are no longer used. AUTHOR
Miquel van Smoorenburg <miquels@cistron.nl> SEE ALSO
inetd(8), init(8), inittab(5), login(1). 16 Jan 2006 rcS(5)

Check Out this Related Man Page

SULOGIN(8)						       System Administration							SULOGIN(8)

NAME
sulogin - Single-user login SYNOPSIS
sulogin [options] [tty] DESCRIPTION
sulogin is invoked by init when the system goes into single user mode. The user is prompted: Give root password for system maintenance (or type Control-D for normal startup): sulogin will be connected to the current terminal, or to the optional tty device that can be specified on the command line (typically /dev/console). After the user exits the single-user shell or presses control-D at the prompt, the system will continue to boot. OPTIONS
-e, --force If the default method of obtaining the root password via getpwnam(3) from the system fails, manually examine /etc/passwd and /etc/shadow to get the password. If they are damaged or nonexistent, sulogin will start a root shell without asking for a password. Only use the -e option if you are sure the console is physically protected against unauthorized access. -p, --login-shell Specifying this option causes sulogin to start the shell process as a login shell. -t, --timeout seconds Specify the maximum amount of time to wait for user input. By default, sulogin will wait forever. -h, --help Print a help message. -V, --version Output version. ENVIRONMENT VARIABLES
sulogin looks for the environment variable SUSHELL or sushell to determine what shell to start. If the environment variable is not set, it will try to execute root's shell from /etc/passwd. If that fails it will fall back to /bin/sh. AUTHOR
sulogin was written by Miquel van Smoorenburg for sysvinit and later ported to util-linux by Dave Reisner and Karel Zak. AVAILABILITY
The sulogin command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils /util-linux/>. util-linux Jul 2012 SULOGIN(8)
Man Page