command scripts for system startup
is the command script that is invoked by
system starts up. It performs system housekeeping chores and starts up system
tied to the
script, which runs commands and daemons pertaining to the network.
is also used to execute any
scripts hold commands which are
pertinent only to a specific site.
All of these startup scripts are controlled to some extent by variables defined
which specify which daemons and services to run.
, it sets the process priority, umask,
and resource limits according to the “daemon” login class as
It then starts
and attempts to execute
the sequence of commands therein.
The first part of
to “preen” all disks of
minor inconsistencies resulting from the last system shutdown and to check for
serious inconsistencies caused by hardware or software failure. If this
auto-check and repair succeeds, then the second part of
is run. However, if the file
exists, fsck will not be invoked.
The file is then removed so that fsck will be run on subsequent boots.
The second part of
configuration variables, mounts filesystems, saves
the file /var/run/dmesg.boot
, starts system
daemons, preserves editor files, clears the scratch directory
, and saves any possible core image
that might have been generated as a result of a system crash, with
If at any point the boot script fails,
single-user mode, allowing the superuser a shell on the console. On exiting
this mode, init again invokes
, but this
time without performing the file system preen.
starts most system daemons,
is executed by
to start daemons that must be run before
the security level changes. Following this,
then sets the security level to '1' if
it wasn't set already by
for the effects of setting the security level.
exists, it is executed once
and then deleted. Any output is mailed to root.
is executed towards the end of
(it is not the very last as there are a
few services that must be started at the very end). Normally,
contains commands and daemons that
are not part of the stock installation.
- Command script for network startup.
- Command scripts for system startup.
- System daemon configuration database.
- Site specific daemon configuration database.
- Directory to hold
- Functions used by the
- Commands run on the first boot after creation.
- Site specific command scripts for system startup.
- Commands run before the security level changes.
- Commands run at system shutdown.
rc not to run
fsck(8) during the
- Copy of dmesg(8)
rc at boot time.
command appeared in