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Extract tar.gz

Operating systems : Linux

Extracting tar.gz files in Linux, command line:

tar zxvf file.tar.gz

- z : filter the archive through gzip [ 1 ]

- x : extract files from an archive

- v : list the files processed

- f : use archive file

The command extracts the contents of a compressed archive to the current directory.

Tar creates an archive of one or several files. Then gzip is used to compress it. Or both processes are made at once by tar only, with corresponding options employed. The duality of nature - archived and compressed after - is reflected in the extension of the file ("tar.gz") and requires two procedures to be performed while extracting: decompressing and unpacking. Hence both z (decompress it) and x (unpack it) in the command.

[ 1 ]

Sources for the option letters description: tar(1) - Linux man page and LinuxCommand.org

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CSS centering floated elements


Centering an inline block containing several inline elements. The block is centered horizontally - [ Open demo page ]. Sometimes there is a need to have a centered group of floated elements, which is to serve as a title or a pagination box. Since this group of floated elements is going to be used as a title for content blocks of various dimensions or pagination box may grow or shrink in its size, then the width of the group of floated elements is to vary unpredictably as well. So a method of centering based on using a certain known width of the box is not going to work. And as an extra to the task there is a desirable condition: the title or pagination box has to be centered once and for all at the time of the box creation, so that this group of floated elements may be reused without any extra work over it: just place the complex where you need it and put the text or / and images you want to inside it - the group is centered anyway. This problem can be solved by several methods using several technologies: CSS, CSS + JavaScript, CSS + HTML (<table></table> tags system). The CSS centering floated elements is the most simple and reliable. So, here a pure CSS centering of floated elements is discussed. CSS centering floated elements: 1. First, a more simple case, css centering of a title box consisting of floated elements: images and text: HTML / XHTML. Code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>CSS centering floated elements: 1</title> <meta http-equiv="Content-Type" content="text/html; charset=Windows-1252" /> <link rel="stylesheet" type="text/css" href="css.css" /> </head> <body> <div class="box"> <span class="title-box"> <img src="snowflake.gif" width="37" height="34" alt="" class="title-imgs" /> <span class="title-text">CSS centering floated elements</span> <img src="snowflake.gif" width="37" height="34" alt="" class="title-imgs" /> </span> </div> </body> </html> CSS.

VBScript rollover. Image swap


VBScript rollover, using image swap. Two examples: several ways of applying VBScript in a web page. VBScript rollover Example 1 HTML / XHTML. Code: <a href="#" onmouseover="onMouse_over()" onmouseout="onMouse_out()"><img src="out.gif" id="rollover" alt="" /></a> VBScript. Code (<script> tag including): <script type="text/vbscript"> Sub onMouse_over() rollover.src='over.gif' End Sub Sub onMouse_out() rollover.src='out.gif' End Sub </script> Note: an external VBScript script file may also be used. The code itself is the same (without <script> tag pair, surely). The file is linked to page very much like a JavaScript file would be: <script type="text/vbscript" src="vbscript.vbs"></script> VBScript rollover Example 2 HTML / XHTML. Code: <a href="#"><img src="out.gif" id="rollover2" alt="" /></a> VBScript. Code (<script> tag including): <script type="text/vbscript" event="OnMouseOver" for="rollover2"> rollover.src='over.gif' </script> <script type="text/vbscript" event="OnMouseOut" for="rollover2"> rollover.src='out.gif' </script>