debian tagged blog post

30 Handy Bash Shell Aliases For Linux / Unix / Mac OS X

last updated December 29, 2017 in Linux, Shell scripting, UNIX

An alias is nothing but shortcut to commands. The alias command allows user to launch any command or group of commands (including options and filenames) by entering a single word. Use alias command to display list of all defined aliases. You can add user defined aliases to ~/.bashrc file. You can cut down typing time with these aliases, work smartly, and increase productivity at the command prompt.

Linux / FreeBSD: PDFCrack A Command Line Password Recovery Tool For PDF Files

last updated June 6, 2012 in FreeBSD, Linux, Linux desktop, Security

I already written about howto remove a password from all PDF files under Ubuntu or any other Linux distribution in a batch mode. However, many user want a simple command to recover password from pdf files. This is useful if you forgotten your password for pdf file. It is also useful for data-archaeologists, computer forensics professionals, people who want to test their password-strength (pdf files generated by webpass) and many more.

Impact of the Debian OpenSSL Vulnerability On other Linux Distribution

last updated June 23, 2008 in CentOS, Debian Linux, Linux distribution, OpenBSD, package management, RedHat/Fedora Linux, Security, Security Alert, Ubuntu Linux, UNIX, Windows, Windows server, windows vista

Can bug present in the Debian OpenSSL packages affect Red Hat / FreeBSD / CentOS Linux UNIX / Windows workstation / server users?

Ubuntu / Debian Linux Find Weak OpenSSL keys

last updated June 16, 2008 in Debian Linux, Howto, Linux, Linux desktop, Monitoring, Networking, package management, Security, Security Alert, Windows, windows vista

Luciano Bello discovered that the random number generator in Debian’s openssl package is predictable. This is caused by an incorrect Debian-specific change to the openssl package (CVE-2008-0166). As a result, cryptographic key material may be guessable.

Security Warning: Serious flaw in Debian Linux OpenSSL Package

last updated May 13, 2008 in Debian Linux, Linux, Security

How Much RAM does my Ubuntu / Fedora Linux desktop PC have?

last updated April 25, 2007 in Howto, Linux, Linux desktop

Here is one of the most frequently asked questions from my mailbag:

Hey I need to know how much ram memory I have in my Ubuntu Linux computer. Under Windows XP I can find out memory by visiting Start > Control Panels > System in control panel. So how do I find out RAM information under Linux PC?

Configure Static Routes In Debian or Red Hat Enterprise Linux

last updated April 13, 2006 in CentOS, Debian Linux, Linux, Networking, RedHat/Fedora Linux, Suse Linux, Ubuntu Linux

Static routes improves overall performance of your network (especially bandwidth saving). They are also useful in stub networks (i.e. there is only one link to the network). For example, each LAN (located at different offices) is connected to HQ IDC (Internet data center) using single T1/LL/Wan links.

For example under Red Hat/Fedora Linux you can add static router for eth0 network interface by editing /etc/sysconfig/network-scripts/route-eth0 file. Under Debian Linux add static route by editing /etc/network/interface file.

Black Screen While Starting X window

last updated April 2, 2006 in Debian Linux, Linux, Linux desktop, RedHat/Fedora Linux, Suse Linux, Sys admin, Tips, Troubleshooting, Ubuntu Linux, X server

My friend is new to Linux, everything was fine until he made some changes to X, which result into this problem. Now whenever he types command startx to start X he get a blank screen. Finally, he contacted me me via yahoo and asked me to get rid rid of this problem.

Step # 1: Reset blank X screen

First, get out of Blank screen by pressing combination of keys Ctrl+Alt+Backspace. If this fails, reboot system.

Step # 2: Reconfigure X server display

At shell, prompt type the following command to reconfigure X display.

If you are using Red Hat /Fedora / CentOS Linux type command:
# redhat-config-xfree86
If you are using Debian Linux type command:
# dpkg-reconfigure xserver-xfree86
OR login as the root user and type command:
# XFree86 -configure

Step # 3: Test new setup

Type startx to test your new settings:
# startx
OR if you used XFree86 â€“configure command to reconfigure X, then test it with following command:
# XFree86 -xf86config /etc/X11/XF86Config.new

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