How to use steghide to embed a text file inside an image.

The steghide program is used to embed one image inside another. I will be showing you how to embed a text file inside an image and then set a passphrase to use when recovering the text file. This is a simple example, I am embedding the file my.txt into a screenshot from a movie. root@user:~# […]

How to mount the Ubuntu filesystem read-write when you have mounted the filesystem in recovery mode.

If you have appended this to the end of the grub command line to change a lost password: init=/bin/bash Ubuntu and you get this error. root@USB-h55-PC:~# passwd jason Enter new UNIX password: Retype new UNIX password: passwd: Authentication token manipulation error passwd: password unchanged Then you may fix this by remounting the filesystem read-write. Accomplish […]

More awesome GTK and WM themes for your Linux desktop.

Window manager themes. RISC styled WM theme for Xfce4: http://www.marutan.net/themes.php. GTK themes. Mac OS Classic theme for Xfce4: http://xfce-look.org/content/show.php?content=144719. Mac OS classic GTK2 theme: http://gnome-look.org/content/show.php/Mac+OS+9+Platinum+gtk+theme?content=110444. Plane GTK: http://gnome-look.org/content/show.php/Plane-Gtk3.6?content=156309. Classic 95 Windows `95 theme for MATE and Gnome: http://gnome-look.org/content/show.php/Classic95?content=157298. How to create a look-alike Windows XP desktop using IceWM: http://kmandla.wordpress.com/projects/lookalike-windows-xp-classic/. Windows 3.1 theme for Xfce4: http://xfce-look.org/content/show.php/Redmond3+%28Windows+3.1+theme%29?content=121526. […]

Sandisk releases a 400GiB SSD that plugs into your DDR3 RAM slot.

Sandisk have released a 400GiB SSD drive that enables a server machine to expand storage by plugging the device into a standard RAM slot. This is an interesting device, the ability to sacrifice a RAM slot and install a Solid State Drive instead. This device, placing storage closer on the motherboard to the CPU is […]

Some miscellaneous Linux commands.

To reboot your Linux machine, use the sudo reboot command. Another way is to type sudo shutdown -r now. To lookup the IP address of a host, use the nslookup command. For example: nslookup google.com. ubuntu@ip-172-31-20-234 ~ % nslookup google.com Server: 172.31.0.2 Address: 172.31.0.2#53 Non-authoritative answer: Name: google.com Address: 74.125.237.193 Name: google.com Address: 74.125.237.194 Name: […]

Interstellar movie shows real physics when depicting a black hole.

The new Interstellar movie is one that showcases science in a positive light as the possible saviour of mankind. We do need to find other planets to settle on, but why not settle on Mars? It has sunlight that we could use for generating power and water. But travelling through a wormhole is one way […]

Count how many times users have successfully logged into your Linux machine.

This command will display a count of successful logins to your Linux machine. jason-H55-USB3% grep ‘session opened’ /var/log/auth.log | wc -l 67 This will display a count of failed login attempts to your Linux machine. jason-H55-USB3% grep ‘FAILED LOGIN’ /var/log/auth.log | wc -l 3 This command will list all of the usernames with failed logins. […]

How to find a file with the Linux command line.

The Linux command line is very useful for finding files, the find command is the best way to locate files on your filesystem. This is a simple example. knoppix@Microknoppix:~$ sudo find /proc -name “meminfo” /proc/meminfo Use the -maxdepth parameter to only search a certain number of levels deep into directories. knoppix@Microknoppix:~$ sudo find / -maxdepth […]

Very useful computing tips for the Internet user.

If you click a link in Google and the forum post you wanted to read requires a login to view, click back and then click the green drop down arrow at the end of the link, then click the cached option. This will open a cached version of the forum posting. This way, you can […]

How to install a Windows feature on server 2012 using Powershell.

This Powershell command will install a Windows feature on your Windows 8.1 or server 2012 machine. I am only using the telnet server as an example. PS C:\Users\Administrator> Install-WindowsFeature telnet-server Success Restart Needed Exit Code Feature Result ——- ————– ——— ————– True No Success {Telnet Server} This is how easy it is to install a […]

Misc UNIX tips for the desktop UNIX or Linux user.

Ralph using a computer.

Get your uptime with the uptime command on Linux. Last login: Tue Oct 28 13:55:23 on ttys000 iMac05:~ admin$ uptime 11:24 up 111 days, 20:38, 2 users, load averages: 0.35 0.16 0.14 The df -Hla command will show your free space in Megabytes or Gigabytes. iMac05:~ admin$ df -Hla Filesystem Size Used Avail Capacity iused […]

List hardware on your Linux system with some simple commands.

The lsdvb command will list all installed DVB hardware in your Linux system. Here it is showing my Realtek DVB stick. You need to use sudo to enable this command to gather more information. jason-H55-USB3 [lsdvb] ~/Documents jason-H55-USB3% sudo lsdvb lsdvb: Simple utility to list PCI/PCIe DVB devices Version: 0.0.4 Copyright (C) Manu Abraham usb […]

Some very useful Gentoo Linux tips for using the emerge command to install software.

The emerge -atv emacs command will tell you what packages will be merged when installing a new package. ec2-user@ip-172-31-30-35 ~ $ sudo emerge -atv emacs * IMPORTANT: 8 news items need reading for repository ‘gentoo’. * Use eselect news to read news items. These are the packages that would be merged, in reverse order: Calculating […]

New Windows package manager available in Powershell 5.0 This is quite revolutionary.

There is a new package manager available for Windows 8.1, this allows the installation of Windows software with the Powershell command line. Windows PowerShell Copyright (C) 2014 Microsoft Corporation. All rights reserved. PS C:\WINDOWS\system32> Install-Package -name Chrome WARNING: Skipping package provider provider ‘NuGet’– missing required option ‘Destination’ The package ‘xChrome’ comes from a package source […]

Some alternative window managers for Linux and UNIX machines.

The FVWM window manager is a light alternative to the bloated default Ubuntu desktop. This is a window manager like TWM, but with more features. Download a copy and get more information here: http://fvwm.org/. TWM is the default window manager that ships with the Xorg distribution. This is a very simplistic window manager that has […]