it - configure a system after installation
/sbin/it
The it program executes scripts before transferring control
of the system to the user, typically before the first
user logs in. The it program executes programs that collect
information such as system name, passwords, timezone,
and current date.
A system can be in a run level at any given time; each run
level has a specific group of processes that run at that
level. The init program operates in one of four run levels:
0, s, 2, or 3. The run level changes when init is
invoked by a privileged user. The it program is run from
/etc/inittab whenever the system is booted or rebooted, or
when a level transition occurs for some other reason, such
as within init3. The it program first determines which run
level the system is coming up under. Next it turns on
shared libraries and swap and then searches for any
/sbin/it.d/run-level directories, where run-level names a
system run level; for example, 2.d, 3.d, 23.d, and so
forth. If any such directories exist, it collects the
names of all files in those directories. These files are
typically links to files in the /sbin/it.d/bin directory
and are created beforehand by itruns(8). After collecting
the file names, it sorts them, eliminates duplicate references,
orders the names as specified by the data file
/sbin/it.d/data/options.mask, executes the files, and
finally removes the files it executed. After all the
files collected from the run level directories have been
handled, it exits.
The /sbin/it.d/data/options.mask file contains a single
line with a list of file names separated by colons. The
it command executes collected files in the order in which
they appear from left to right in the options.mask file.
Programs not listed in the options.mask file are executed
after those defined in options.mask. These "unspecified"
programs are run in the order into which they were initially
sorted; that order is controlled by the LC_COLLATE
environmental variable and the specifications in the
/usr/lib/nls/loc/locale files.
Specifies execution priorities of files to be run by it
Files to be linked by itruns(8) for execution by it
Commands: init(8), itruns(8), rc0(8), rc2(8), rc3(8),
who(1)
it(8)
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