kadamalla: Linux Tutorial Topics:

Note that any given object can relate to more than one topic, so it is likely that pages will appear more than once. For example, concepts may relate to topics that are slightly different from the topic of the page where they are discussed in detail.

Administration

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Concepts

Cron is started through an rc-script like most system daemons.
Cron can be disabled through the /etc/rc.config file.
Many system daemons are activated through the /etc/rc.config file
You can run a command as a different user with the 'su' command.
Messages can be sent to the system logger daemon on other machines.
You can switch the user you run a program as using the 'su' command.
You can watch the output of a program using the watch command.
Two device nodes with completely different names could have the same major and minor numbers and are therefore the exact same device.
The file .hushlogin in your home directory creates a "silent" login.
The who command will tell you who is currently logged in.
The last command will tell you recently logged in users.
The master boot record located first sector on the hard disk.
Errors encountered as the system boots can be found in /var/log/messages.
The system logging daemon is syslogd.
The first process started is init.
The configuration file for the init program is stored in the file /etc/inittab.
Run-level 0 is used to shutdown the system.
By convention, the start-up and shutdown scripts are usually the exact same file, but with a different name.
The 'shutdown' command can send warnings at regular intervals as the system is shutting down.
The terms "user" and "user account" are often interchanged in different contexts.
Typically a "user" is a real person and the "user account" is the evironment when the user logs in.
The name of the file's owner is not stored in the file's inode.
The 'stty' command can show you your current terminal settings.
Applications react to "terminal capabilities" as apposed to specific keys.
You change special keys like your "delete" key using the stty command.
The TERM variable defines the specific terminal type you are using.
A print output that "stair steps" is usually caused by not sending carriage returns.
The 'crontab' command is used to submit commands to cron.
Cron cannot run commands more often than once a minute.
The 'at' command can be used to run a job only once at a specific time.
You cannot specify when jobs are started with the batch command.
When using the wall command, the root user can still send to users who have messaging disabled.
Kernels with an odd numbered minor_release are considered "development" releases. T
"Rebuilding" a kernel consists of compiling C-lanuage source code files.
After a kernel is rebuilt it is usually "activated" with the 'lilo' command.
Lilo can boot operating systems on different drives as well as different partitions.
Under Linux hardware is accessed through special files called "device nodes".
All the software functions for a specific device are jointly referred to as a
A device node's "major number" tells you what type of device it is.
A device which works with one Linux distribution, may not necessary work with others. (Although it usually does)
An "unsupported" device typically only means that your particular distribution does not include a driver.
Spreading system and user files on different file systems can be safer than a single filesystem.
Having twice as much swap as you do ram is a common recommendation.
PC BIOSs are limited to 1024 cylinders.
Unlike DOS, Linux can created multiple primary partitions.
System messages can be sent to the system logger daemon on other machines.
Like DOS and Windows, you can configure Linux so that Ctrl-Alt-Del will reboot your system (or not, if you choose).
The 'who' command will show you who is currently logged in.
Entries in the crontab are in the order: minute, hour, day of the month, month of year, day of week
By default, output of cronjobs is sent to the appropriate user by email.
The root user can configure cron to run jobs as a particular user by placing them in /etc/crontab.
On busy systems cronjobs might end up being skipped if they are run every minute.
Each entry in the /etc/printcap file consists of single logical line.
The primary administrative directory for printers is /usr/spool.
The highest syslog priority is emerg.
The syslogd configuration file is /etc/syslog.conf.
Linux is susceptible to boot viruses, just like windows
The computer BIOS will try to boot from the active partition.
The secondary boot loader provides the prompt and processes the various option.
The information displayed during the boot process is typically written to /var/log/messages.
Another term for run-level 1 is single-user or maintenance mode.
System process that run in the brackground are typically referred to as daemon processes.

kadamalla

Monday, May 18, 2009

Linux Tutorial Topics:

Administration

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Concepts

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