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Unix+clones

Execute Commands on Multiple Linux or UNIX Servers part II

Post date: December 28, 2005, 10:12 Category: System Views: 3335 Comments
Tutorial quote: I have already covered how to execute commands on multiple Linux or UNIX servers via shell script. The disadvantage of script is commands do not run in parallel on all servers. However, several tools exist to automate this procedure in parallel. With the help of tool called tentakel, you run distributed command execution. It is a program for executing the same command on many hosts in parallel using ssh (it supports other methods too). Main advantage is you can create several sets of servers according requirements. For example webserver group, mail server group, home servers group etc. The command is executed in parallel on all servers in this group (time saving). By default, every result is printed to stdout (screen). The output format can be defined for each group.
Unix+clones

Sudo FAQ

Post date: February 26, 2007, 21:02 Category: Security Views: 4229 Comments
Tutorial quote: Sudo is a simple program which allows the administrator to give regular users extra permissions to execute the commands they would normally not be allowed to use. Thanks to sudo, we can execute commands that are usually restricted to the root account. In practice, it looks like that: instead of typing su ->password -> command you type sudo command. In order to use sudo you need to configure it properly. This FAQ is supposed to help you with this task.
Linux

Grub From the Ground Up

Post date: April 12, 2005, 17:04 Category: Software Views: 2738 Comments
Tutorial quote: Grub is a world-class boot loader with insufficient documentation. In many ways it blows the doors of LILO. For instance, it's MUCH easier to use Knoppix to rebuild a grub boot loader than to rebuild a LILO boot loader. However, until you're comfortable with grub, it might seem just the opposite. All too often grub dumps you at a grub> prompt with no hint of what you should do. You might have heard that a successful reboot is just three commands away, but which commands? The state of grub's documentation is such that you can't figure it out unless you already know grub.

That catch 22 is the very purpose of this document. This document will to give you enough grub expertise that you can create a grub boot floppy on a working machine with grub installed (not necessarily as the bootloader, just installed), and use that floppy to bust back into a Linux machine with a blown bootloader, and then use that floppy to actually install grub as the bootloader.

This document does not discuss using grub to boot or dual boot Windows, mach, BSD, or other non-Linux operating systems. I might write on that subject later. But in the meantime, once you're familiar with the principles and practices of grub, given some study of existing documentation you'll probably be able to use grub to boot non-Linux operating systems.
Linux

Scheduling Backup Jobs using at and crontab

Post date: April 21, 2006, 16:04 Category: Installing Views: 2204 Comments
Tutorial quote: You can schedule a command or a script using two tools

crontab : Schedules tasks once or repeatedly.

You can use the crontab command to run commands at regular times. For example, you could schedule a backup of your files every Friday. Commands can be scheduled to the minute.

at : Schedules tasks once.

You can use the at command to schedule a command or script to run a single time. The command includes several utilities
Unix+clones

Obscure Linux Commands: Cheating At Word Games

Post date: September 26, 2007, 09:09 Category: Miscellaneous Views: 3551 Comments
Tutorial quote: Using crossword puzzles and Scrabble games to learn regexp by using grep, awk, an (anagram generator) and the dictionary file to cheat at them.
Linux

Slim Down and Speed Up Linux

Post date: December 17, 2007, 06:12 Category: Optimizing Views: 7254 Comments
Tutorial quote: While Linux is pretty efficient with a computer's resources out of the box, there are still ways you can make it run leaner and meaner on your desktop. Using a little bit of know-how, a willingness to run a few terminal commands and a mind for efficiency, you can get every last bit of power from your Linux box, or get more life from an older system. Read on for a roundup of ways to slim down and speed up Linux that any level of user can implement.
Unix+clones

How To Look Like A UNIX Guru

Post date: October 30, 2006, 02:10 Category: Miscellaneous Views: 5686 Comments
Tutorial quote: UNIX is an extremely popular platform for deploying server software partly because of its security and stability, but also because it has a rich set of command line and scripting tools. Programmers use these tools for manipulating the file system, processing log files, and generally automating as much as possible.

If you want to be a serious server developer, you will need to have a certain facility with a number of UNIX tools; about 15. You will start to see similarities among them, particularly regular expressions, and soon you will feel very comfortable. Combining the simple commands, you can build very powerful tools very quickly--much faster than you could build the equivalent functionality in C or Java, for example.

This lecture takes you through the basic commands and then shows you how to combine them in simple patterns or idioms to provide sophisticated functionality like histogramming. This lecture assumes you know what a shell is and that you have some basic familiarity with UNIX.
OpenSUSE

Linux Kernel Magic SysRq keys in openSUSE for crash recovery

Post date: September 28, 2008, 17:09 Category: System Views: 3367 Comments
Tutorial quote: The Linux Kernel offers you something that allows you to recover your system from a crash or at the least lets you to perform a proper shutdown using the Magic SysRq Keys. The magic SysRq key is a select key combination in the Linux kernel which allows the user to perform various low level commands regardless of the system’s state using the SysRq key. It is often used to recover from freezes, or to reboot a computer without corrupting the filesystem.
OSX

Unix FAQ (OS X)

Post date: October 22, 2006, 02:10 Category: System Views: 6255 Comments
Tutorial quote: Answers to frequently asked questions about using Unix-level commands on OS X. Serves as a relatively gentle introduction to the command-line interface for novices.
Linux

A Beginner's Guide To LVM

Post date: January 16, 2007, 19:01 Category: System Views: 3879 Comments
Tutorial quote: This guide shows how to work with LVM (Logical Volume Management) on Linux. It also describes how to use LVM together with RAID1 in an extra chapter. As LVM is a rather abstract topic, this article comes with a Debian Etch VMware image that you can download and start, and on that Debian Etch system you can run all the commands I execute here and compare your results with mine. Through this practical approach you should get used to LVM very fast.
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