uncleflo
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Saved by uncleflo on September 15th, 2013.
A shell script is a sequence of commands for which you have a repeated use. This sequence is typically executed by entering the name of the script on the command line. Alternatively, you can use scripts to automate tasks using the cron facility. Another use for scripts is in the UNIX boot and shutdown procedure, where operation of daemons and services are defined in init scripts. To create a shell script, open a new empty file in your editor. Any text editor will do: vim, emacs, gedit, dtpad et cetera are all valid. You might want to chose a more advanced editor like vim or emacs, however, because these can be configured to recognize shell and Bash syntax and can be a great help in preventing those errors that beginners frequently make, such as forgetting brackets and semi-colons.
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Cool Solutions: Creating Custom init Scripts
Saved by uncleflo on September 5th, 2013.
Novell/SUSE Linux uses a system of scripts to determine which services to run on system boot. These scripts exist in /etc/init.d/ (or the symbolic link /etc/rc.d/), and are referred to as 'init scripts.' They help dictate which services are active in each runlevel, and also allow the services to be manually controlled. For more information on runlevels, see this article. Each service that ships with Novell/SUSE Linux installs a script in /etc/init.d/. If a custom service is installed it may not have a init script. This article explains how to create these scripts.
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initrd - Linux Command - Unix Command
Saved by uncleflo on August 31st, 2013.
The special file /dev/initrd is a read-only block device. Device /dev/initrd is a RAM disk that is initialized (e.g. loaded) by the boot loader before the kernel is started. The kernel then can use the the block device /dev/initrd's contents for a two phased system boot-up. In the first boot-up phase, the kernel starts up and mounts an initial root file-system from the contents of /dev/initrd (e.g. RAM disk initialized by the boot loader). In the second phase, additional drivers or other modules are loaded from the initial root device's contents. After loading the additional modules, a new root file system (i.e. the normal root file system) is mounted from a different device.
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UbuntuBootupHowto - Community Ubuntu Documentation
Saved by uncleflo on March 7th, 2012.
Since the introduction of Upstart some time in 2006, or more relevantly 9.10 Karmic where most of the system services were converted, the boot process changed somewhat. The following information is tested on 11.04 Natty. Please note that generally, you can use either traditional sysvinit scripts and the methods of working with them as well as the new upstart configs and the command: "service" interchangeably. It is however recommended you use the new upstart methods which are both forward and backward compatible.
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