Extracting Files from an Archive

To extract (or unpack) the contents of a tar archive, use tar with the `−x' ("extract") option. · To extract the contents of an archive called `project.tar', type: $ tar −xvf project.tar RET

Tracking Revisions to a File

The Revision Control System (RCS) is a set of tools for managing multiple revisions of a single file.

Checking Out a File Revision

Use co to check out a revision of a file from an RCS repository. To check out the latest revision of a file that you intend to edit (and to check in later as a new revision), use the −l (for "lock") option. Locking a revision in this fashion prevents overlapping changes being made to the file should another revision be accidentally checked out before this revision is checked in.

Viewing a File's Revision Log

Use rlog to view the RCS revision log for a file−−type rlog followed by the name of a file to list all of the revisions of that file.
· To view the revision log for file `novel', type: $ rlog novel RET

Concatenating Text

The cat tool gets its name because it concatenates all of the text given to it, outputting the result to the standard output. It is useful for concatenating files of text together. For example, suppose you have two files, `early' and `later'. The file `early' contains this text:

Process control

In this article you can find useful information about handling processes in Linux/Unix systems like how to send a command in the background. Every New Systems Administrator should know how to use those commands.

About password security

Weak passwords are probably the most common source of security problems. Even at home, you may expose yourself to trouble if somebody is able to hack your computer when you browse the Internet and read your files. Here are some examples of hazardous passwords:

How to display Network interface statistics

In this article it is explained how to use nestat command to show statistics of eth0,localhost,wireless or any other interface.

How to display CPUs in Linux

Simply type on shell less /etc/cpuinfo . The first lines of the output are similar to...

Does Help command exists in Linux?

Most Linux commands can be run with the "--help" option. For example, this will give you a concise help on the Linux cp (copy) command: cp --help | less

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