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Full Discussion: auto startup of a program
Top Forums UNIX for Dummies Questions & Answers auto startup of a program Post 6643 by kapilv on Sunday 9th of September 2001 11:02:08 AM
Old 09-09-2001
Hi

It depends on at what runlevel your system comes up.Suppose if your system comes up at run level 3 then you need to place the startup script in the directory where your other run level 3 scripts are placed or in the directory where your other run level 2 scripts (run level 2 , i am saying b'cos run level 2 is an intermediate state when your system comes up in run level 3). Also the startup script should start with alphabet S followed by a number. The number indicates the order in which the scripts are executed. Actually the scripts in the /etc/rc?.d directory are links to files placed in /etc/rc.d directory and these files are executed when the system comes up. Usually people keep DATABASE startup and shutdown scripts in these directories so that when a system comes up the database starts and when the sysem goes down the database also goes down and it's manually done.

Hope this helps
 

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rc.config(4)						     Kernel Interfaces Manual						      rc.config(4)

NAME
rc.config, rc.config.d - files containing system configuration information SYNOPSIS
DESCRIPTION
The system configuration used at startup is contained in files within the directory The file sources all of the files within and and exports their contents to the environment. /etc/rc.config The file is a script that sources all of the scripts, and also sources To read the configuration definitions, only this file need be sourced. This file is sourced by whenever it is run, such as when the command is run to transition between run states. Each file that exists in is sourced, without regard to which startup scripts are to be executed. /etc/rc.config.d The configuration information is structured as a directory of files, rather than as a single file containing the same information. This allows developers to create and manage their own configuration files here, without the complications of shared ownership and access of a common file. /etc/rc.config.d/* Files This is where files containing configuration variable assignments are located. Configuration scripts must be written to be read by the POSIX shell, and not the Bourne shell, or In some cases, these files must also be read and possibly modified by control scripts or the sam program. See sd(4) and sam(1M). For this reason, each variable definition must appear on a separate line, with the syntax: No trailing comments may appear on a variable definition line. Comment statements must be on separate lines, with the comment character in column one. This example shows the required syntax for configuration files: Configuration variables may be declared as array parameters when describing multiple instances of the variable configuration. For example, a system may contain two network interfaces, each having a unique IP address and subnet mask (see ifconfig(1M)). An example of such a dec- laration is as follows: Note that there must be no requirements on the order of the files sourced. This means configuration files must not refer to variables defined in other configuration files, since there is no guarantee that the variable being referenced is currently defined. There is no protection against environment variable namespace collision in these configuration files. Programmers must take care to avoid such prob- lems. /etc/TIMEZONE The file contains the definition of the environment variable. This file is required by POSIX. It is sourced by at the same time the files are sourced. SEE ALSO
rc(1M). rc.config(4)
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