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the system as an unprivileged user, use the su command to obtain superuser status, and kill whatever process is hanging the system. You can then resume normal operation.
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For a multiuser system, the most important control scripts reside in the /etc/rc2.d and / etc/rc3.d directories, which are responsible for enabling multiuser services and NFS network resource sharing, respectively. A basic script for starting up a Web server looks like this:
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#!/bin/sh # Sample webserver startup script # Should be placed in /etc/rc2.d/S99webserver case "$1" in 'start') echo "Starting webserver...\c" if [ -f /usr/local/sbin/webserver ]; then /usr/local/sbin/webserver start fi echo "" ;; 'stop') echo "Stopping webserver...\c" if [ -f /usr/local/sbin/webserver ]; then /usr/local/sbin/webserver stop fi echo "" ;; *) echo "Usage: /etc/rc2.d/S99webserver { start | stop }" ;; esac
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This file should be created by root (with the group sys) and placed in the file /etc/ rc2.d/S99webserver, and should have executable permissions:
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# chmod 0744 /etc/rc2.d/S99webserver # chgrp sys /etc/rc2.d/S99webserver
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This location of the file is a matter of preference. Many admins treat the Web server similar to an NFS server. In this regard the system run-level 3 represents a share state. Note that because a Web server is a shared service, you could also start it from a script in /etc/rc3.d. When called with the argument start (represented in the script by $1), the script prints a status message that the Web server daemon is starting, and proceeds to execute the command if the Web server binary exists. The script can also act as a kill script, because it has a provision to be called with a stop argument. Of course,
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a more complete script would provide more elaborate status information if the Web server binary did not exist, and may further process any output from the Web server by using a pipe (e.g., mailing error messages to the superuser). One of the advantages of the flexible boot system is that you can execute these scripts to start and stop specific daemons without changing the init state. For example, if you were going to update a web site and needed to switch off the Web server for a few minutes, the command
# /etc/rc2.d/S99webserver stop
would halt the Web server process, but would not force the system back into a singleuser state. You could restart the Web server after all content was uploaded by typing the following command:
# /etc/rc2.d/S99webserver start
In order to conform to System V standards, it is actually more appropriate to create all the run control scripts in the /etc/init.d directory and create symbolic links back to the appropriate rc2.d and rc3.d directories. This means that all scripts executed by init through different run levels are centrally located and can be easily maintained. With the Web server example, you could create a file in /etc/init.d with a descriptive filename:
# vi /etc/init.d/webserver
After adding the appropriate contents, you could save the file and create the appropriate symbolic link by using the symbolic link command ln:
# ln -s /etc/init.d/webserver /etc/rc2.d/S99webserver
Using this convention, kill and startup scripts for each service can literally coexist in the same script, with the capability to process a start argument for startup scripts, and a stop argument for kill scripts. In this example, you would also need to create a symbolic link to /etc/init.d/webserver for K99webserver.
Writing Kill Scripts
Under System V, kill scripts follow the same convention as startup scripts, in that a stop argument is passed to the script to indicate that a kill rather than a startup is required, in which a start argument would be passed. A common approach to killing off processes is to find them by name in the process list. The following script kills the asynchronous PPP daemon, which is the link manager for the asynchronous data link protocol. This daemon is started by using aspppd thus, the script generates a process list, which is piped through a grep to identify any entries containing aspppd, and the process number is extracted using awk. This value is assigned to a variable ($procid),
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