Sometimes it is very useful to delete / remove Bash history partially or completely when log out. Here is my favourite methods howto log out / quit / exit Bash shell without saving Bash history.
Remove Only Current Session Bash History and Leave Older History Untouched
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1. Quit Bash Shell Without Saving History: Unset HISTFILE
unset HISTFILE && exit
2. Quit Bash Shell Without Saving History: Kill Console
kill -9 $$
Remove/Delete Bash History...
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 2003
Windows...
This guide explains howto install Google Chrome Web browser on Fedora 27/26/25/24 and CentOS/Red Hat (RHEL) 7.4. Best way to install and keep up-to-date with Google Chrome browser is use Google's own YUM/DNF repository.
Install Google Chrome on Fedora 27/26/25/24, CentOS 7.4, Red Hat (RHEL) 7.4
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1. Change to root user.
sudo -i
## OR ##
su -
2. Enable Google YUM repository
Note: Google Chrome Linux version doesn't get any 32-bit (x86) updates and 32-bit...
This is guide, howto Install Oracle (Sun) Java JDK and JRE 8 update 151/152 (8u151/8u152) on Fedora 27/26/25/24, CentOS 7.4/6.9, Red Hat (RHEL) 7.4/6.9. I use here 151 version, but 152 installation is exactly same. Java 8 JRE/JDK update 151/152 is last public update for Java 8.
If you're looking installation instruction for older Oracle Java versions, then check Install Sun/Oracle Java JDK/JRE 7 on Fedora 24/23/22/21/20/19, CentOS/Red Hat (RHEL) 7.2/6.9/5.11 or Install Sun/Oracle Java...
Memcached is a high-performance, distributed memory object caching system, generic in nature, but originally intended for use in speeding up dynamic web applications by alleviating database load. Memcached is a very useful also in other cases, than only dynamic web applications.
This guide explains howto install Memcached 1.5.1/1.4.17/1.4.36 stable version of distributed memory object caching system on Fedora 27/26/25/24/23/22 and CentOS / Red Hat (RHEL) 7.4/6.9/5.11. Fedora...
This is quick guide howto show Linux version, howto show Linux distributin (distro) info, howto show Linux System information, kernel version and kernel information on command line.
Show Linux Version
Linux version information can be checked using the following commands:
cat /proc/version
Another way to check Linux Version information is following:
dmesg | grep "Linux version"
Example output:
Linux version 4.11.10-300.fc26.x86_64...
This is quick tip, howto get internal IP address and external IP address on Linux Shell / Command Line. This guide also show, howto make useful Bash functions to get IP addresses quickly.
Note: All functions could be named as you wish and to make functions permanent, add functions to ~/.bashrc or /etc/bashrc. Also all awk commands should work also with gawk and nawk.
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1. Get Internal IP Address(es) on Linux Shell / Command Line
1.1 Get IP and IPv6 Address by...
Please note: This guide still working normally if you want install Sun/Oracle Java 7, but if you want Java 8 version, then check Install Oracle Java JDK/JRE 8 on Fedora, CentOS/RHEL.
This is guide, howto Install Sun/Oracle Java JDK and JRE 7 CPU (7u79) and PSU (7u80) on Fedora 24/23/22/21/20/19/18/17/16/15/14/13/12, CentOS 7.2/6.8/5.11, Red Hat (RHEL) 7.2/6.8/5.11. Read more, what is difference between CPU and PSU release.
If you're looking instruction for Sun/Oracle Java JDK/JRE...
Are you looking LibreOffice 5.2/5.1/5.0 Install guide?
This is quick guide to install Apache OpenOffice 4.1.2 on Fedora 24/23/22/21/20/19/18/17/16/15/14/13/12, CentOS 7.2/6.8, Red Hat (RHEL) 7.2/6.8 with using Apache OpenOffice original RPM packages.
What's new in Apache OpenOffice 4.1.2 release
New Sidebar - The Sidebar makes better use of today's widescreen displays than traditional toolbars
Interoperability Improvements
DrawObject...
Simple PHP function that formats the bytes to the desired form. Possible unit options are:
Byte (B)
Kilobyte (KB)
Megabyte (MB)
Gigabyte (GB)
Terabyte (TB)
Petabyte (PB)
Exabyte (EB)
Zettabyte (ZB)
Yottabyte (YB)
Function takes three parameter: (bytes mandatory, unit optional, decimals optional)
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PHP byteFormat function for formatting bytes
<?php
function byteFormat($bytes, $unit = "", $decimals = 2) {
$units = array('B' =>...
This is quick SVN (Subversion) tip, howto remove added file from SVN repository without deleting file from local filesystem.
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Remove File From SVN Repository and Keep Local File
svn delete --keep-local path/to/file.example
Real example:
svn delete --keep-local css/test.css
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Real world usage example
Adding a whole directory add a file that was not intended to SVN reads, but should be retained locally.
svn add css/
A ...
This is quick guide, howto Backup (dump) and Restore (load) SVN (Subversion) repository on Linux. This is actually very simple and important task. SVN backup and restore is useful when you want to move your repos to new server or you need to recover your data. I assume here that you have Subversion (SVN) installed and you have existing repositories. If you installed and created testrepo with earlier guide then you can check real examples.
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1. Backup (dump) SVN...
This is a quick method with using cURL to check that Apache Compression with mod_gzip and mod_deflate is working. Only the remote server headers are needed.
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Check that the Apache Compression is Working
Get headers
curl -I -H 'Accept-Encoding: gzip,deflate' http://www.if-not-true-then-false.com
-I option which will make just HEAD request to server and get headers.
-H option add header for accecpt content-encondig gzip and deflate.
Check headers
...
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...
Looking Fedora 22/21 nVidia Drivers Install Guide?
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This is guide, howto install nVidia proprietary drivers on Fedora 14 and disable Nouveau driver. I write this guide about two weeks ago, but I Delayed the publication of this guide, because of pyxf86config bug, which cause following livna-config-display errors on boot:
Checking for module nvidia.ko: [ OK ]
Enabling the nvidia driver: Traceback (most recent call last):
File...
Looking Fedora 22/21 nVidia Drivers Install Guide?
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I've tried this method in few Fedora 12 and Fedora 13 machine, and looks like it is working. Nouveau has been enabled by default starting from Fedora 11 and looks like nouveau cause some problems on Fedora 12 and Fedora 13, when try to use nVidia proprietary driver.
Note: nVidia proprietary drivers on Fedora 12 and Fedora 13 does not support older cards than GeForce 6 cards (except for some exceptions, check...
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...
Please note: This guide still working normally if you want install Sun/Oracle Java 6, but if you want Java 8 version, then check Install Oracle Java JDK/JRE 8 on Fedora, CentOS/RHEL or if you want Java 7 version, then check Howto Install Sun/Oracle Java JDK/JRE 7 on Fedora, CentOS/Red Hat (RHEL).
By default, Fedora 19/18/17/16/15/14/13/12 and CentOS/Red Hat (RHEL) 6.4/6.3/6.2/6.1/6/5.9 Linux operating systems use the OpenJDK Java, which is a good choice for normal use and it works with...
GNU Privacy Guard (GnuPG or GPG) is a free software alternative to the PGP suite of cryptographic software. This is quick guide, howto Encrypt and Decrypt files on Linux with password using GPG.
This guide deals with both the interactive mode and the non interactive mode. Interactive mode is useful when the purpose is encrypt some files on the command line. Non interactive mode is useful when the purpose is encrypt files using scripts. This guide also deals with single file...
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...
1
2
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