Oracle VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.
VirtualBox supports a large number of guest operating systems:
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Windows 3.x
Windows NT 4.0
Windows 2000
Windows XP
Windows Server...
Nano is easy to use and lightweight command line text editor for Linux and UNIX systems. Nano text editor can use either the default settings or improve settings with customized nanorc-file. Here are some tips that can improve the usability of Nano. Changes can be made to nanorc file, either locally or to all users or options can be used as command line options.
First is good to check Nano compiled options, with command:
nano -V
Nano should be compiled with --enable-nanorc...
PHP Command Line Interface (CLI) has not built-in coloring for script output, like example Perl language has (perldoc.perl.org/Term/ANSIColor.html). So I decided to make own class for adding colors on PHP CLI output. This class works only Bash shells. This class is easy to use. Just create new instance of class and call getColoredString function with string and foreground color and/or background color.
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PHP Class for Coloring PHP Command Line (CLI) Scripts...
Sometimes it feels that many of the excellent and convenient command-line tools is forgotten, when they are replaced by graphical tools. A good example is the cal program, which is a command-line calendar to Linux and UNIX. It displays a simple calendar in text format.
Cal usage:
Displays current month calendar on console:
cal
Output:
October 2009
Su Mo Tu We Th Fr Sa
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30...
This is quick guide howto find files and directories quick and efficiently on Linux with locate command. Linux find command is outdated, slow and complicated to use, so locate command is much better option.
Locate basic usage find files and directories
locate file
# example
locate httpd.conf
locate path
# example
locate /X11/
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This is a very typical case, the need to create a temp file on the command line quickly. Opening editor, writing content, save file and quit editor is not the fastest possible way. A faster way is to use the cat command with the name of the file and write contents of the file and give the end-of-file character (Ctrl-D).
This is guide, howto create (or append to) text file without text editor on Linux shell / command line.
Create Text File Without Text Editor on Command Line
#...
Sometimes you maybe have to handle files with a dash (-) as first character from Linux command line. It can be difficult, because the script "thinks" the marks after the dash are parameters.
So files which name begins with dash (-) can not be dealt with directly by typing the command and the file name, such as the following:
less -file-with-a-dash-as-first-character
Files which name begins with dash (-) can be used as follows:
less ./-file-with-a-dash-as-first-character
Real...
Today I started thinking that how cool is do some Google searches straight from command line. First I try to find some ready tricks from the Internet, but I couldn't find quickly anything good. So I decide do a simple Bash function that can take Google search as parameter and open Firefox Browser (tab) with Google search. Sounds easy... :)
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Here is easy way add date and time to Linux terminal title. This trick works at least following terminals Gnome Terminal, xterm, urxvt, rxvt.
Simply type the following command line:
while sleep 1 ; do echo -ne '\033]2;'`date`'\007'; done &
This tip is really useful if you need/want to monitor multiple servers at the same time. This Tip works, as the tip, by which you can add the date and time the title of the Linux terminal, but it adds more usefull info to terminal title. Following bash one liner add hostname, date, time, uptime, users and load Average to Linux Terminal Title and updates it every second.
This trick works at least following terminals: Gnome Terminal, xterm, urxvt, rxvt.
Add hostname, date, time, uptime,...
I noticed that the Fedora Linux with KDE desktop, has reasonably poor support for laptop touchpad adjustment. For example, the KDE > System Settings > Keyboard & Mouse > Mouse options will not be able to enable vertical scrolling and touchpad tapping. So I decided to write this short guide, howto enable Touchpad vertical scrolling and tapping from command line without any GUI.
Enable Laptop Touchpad Vertical Scrolling
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PHP MongoDB (Mongo Database) Driver Installation on Linux, UNIX, BSD and Mac OS X
MongoDB PHP driver is very simple install on Linux, UNIX, BSD and Mac OS X. You need just PEAR (PHP Extension and Application Repository) with PECL repository. Normally PHP development (dev) package and PHP Pear package installation from package management system is enough to get PEAR working. Also go-pear.php script can be used.
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Sometimes need to delete files whose contents should disappear absolutely, completely and safely. Linux command rm just remove file and it is still possible to dig out from the disk. Fortunately for Linux can be found in shred program that removes the files permanently. Shred command is easy and quickly to use cases when files need to deleted forever.
Shred command usage
Create test file:
echo "testing testing" > /tmp/test.txt
Delete file with shred command:
shred -v -n 25 -u...