Use the Gnome favorites barUse a blue light filter for GnomeSet GTK 3.0 theme with command line Use the Gnome favorites bar To add applications to the favorites bar on the left of the screen in Gnome 3, just right click on any application icon in the applications menu and…
Read MoreIf you need to perform a command a second time on a different file, you can use command replacement with the ^ symbol. e.g. cp foo.txt /to/some/directory then ^foo^bar, expanding to: cp bar.txt /to/some/directory. To find information about a particular command, the apropos utility can be very helpful, this will…
Read MoreWhat is the difference between a hard link and a symbolic link? The output below shows the process of creating firstly a hard link and then a symbolic link. The hard link appears exactly the same as the original file; but the symbolic link displays as a link from the…
Read MoreThe many Linux distributions we have today have come a long way since the old days. The evolution of the Linux desktop has lead us in strange directions, culminating in the Gnome Shell desktop interface, as well as Ubuntu Unity. But these have some nice features that make up for…
Read MoreThe ldd command will print out a list of all libraries that an executable is linked against. This is the output for a simple “Hello World” command. 20:15:31 tux@linux-v415 ($ ldd ./a.out linux-vdso.so.1 => (0x00007fff171ff000) libc.so.6 => /lib64/libc.so.6 (0x00007fe56ef58000) /lib64/ld-linux-x86-64.so.2 (0x00007fe56f2e8000) 20:15:49 tux@linux-v415 ($20:15:31 tux@linux-v415 ($ ldd ./a.out linux-vdso.so.1 =>…
Read MoreTo trim multiple spaces from a sentence and turn it back into properly readable text, use this sed syntax. sed ‘s/ \+/ /g’sed ‘s/ \+/ /g’ This is an example. echo "Hello, this sentence has multiple spaces in it and needs fixing." Hello, this sentence has multiple spaces in it…
Read MoreThe brave web browser is a very secure alternative to Firefox and Chromium for the Linux platform. To install this browser on Ubuntu 18.04, use snap. 4.4 Wed Sep 25 jason@Yog-Sothoth 0: $ sudo snap install brave Warning: /snap/bin was not found in your $PATH. If you’ve not restarted your…
Read MoreThis command will print information about your swap partition easily using the Linux command line. root@Yog-Sothoth:~# swapon -s -v Filename Type Size Used Priority /dev/sda5 partition 7811068 0 -2 /dev/dm-1 partition 62500860 0 -3root@Yog-Sothoth:~# swapon -s -v Filename Type Size Used Priority /dev/sda5 partition 7811068 0 -2 /dev/dm-1 partition 62500860…
Read MoreThere is a nice new Linux distribution, LXLE. This is a very light and fast Linux distro based on Ubuntu. This would run fine on an older machine that cannot handle the full Ubuntu distribution. This is very helpful of the user has an old machine that they are not…
Read MoreHow to use rsync to send files from your hard disk to a backup drive. This example will copy the files from a folder to a backup drive and the ipinfo folder will be created on your backup HDD. rsync -av Documents/ipinfo/ /media/jason/Seagate\ Expansion\ Drive/Linux/ipinfo/ sending incremental file list created…
Read MoreImageMagick(1) can be used to put a watermark on an image easily. The command below will place a TV styled watermark on an image in the lower left corner. This is very useful to watermark images you place on the Internet. convert pripyat.jpg ABCTV2005.png -gravity southeast -composite output.pngconvert pripyat.jpg ABCTV2005.png…
Read MoreAdd a new directory to the PATH to allow running an application from it without typing the full path every time you wish to run it. PATH=$PATH:/usr/local/binPATH=$PATH:/usr/local/bin Or you may have something like this in your .bashrc to add this every time you log in. PATH="/home/jason/perl5/bin${PATH:+:${PATH}}"; export PATH;PATH="/home/jason/perl5/bin${PATH:+:${PATH}}"; export PATH;…
Read MoreCysCA hacking challenge penetration testing results, how students overcame a few vulnerable network servers and successfully captured flags. Students Write-ups. A number of write-ups submitted by the students on the day, this is a document of their solutions for the challenge. https://www.cyberchallenge.com.au/pdf/CySCA2018-Students.pdf. Active Defense pentest. https://www.cyberchallenge.com.au/pdf/CySCA2018-Active_Defence_Questions.pdf. These resources might give…
Read MoreThe default Linux behavior allows the user to gain root access by typing su and entering the root password to gain a root prompt. If you wish to disable this behavior, then open this file as root for editing. jason@jason-Virtual-Machine:~$ vim /etc/pam.d/sujason@jason-Virtual-Machine:~$ vim /etc/pam.d/su Then un-comment this line. auth required…
Read MoreStalker Call of Pripyat is easy to run on Linux. This is due to the new OpenXray engine available for Windows and Linux. I managed to finally build this on Ubuntu 18.04 with gcc-8. Firstly, download and install the required source code. 4.4 Wed Aug 28 jason@Yog-Sothoth 0: $ git…
Read MoreTo recall the last entered command on the Linux console, press the Ctrl-P key shortcut. You may also press the up arrow to recall the command, but the Ctrl-P shortcut is another good way to perform this feat. The CTRL-A shortcut will jump to the beginning of the line you…
Read MoreUsing Digital TV on Linux is possible, but it depends on the adapter whether it will work or not. I had a Compro DVB T-300 digital TV card in my old PC. And the digital TV support will only work on Windows, I have to use a USB device to…
Read MoreThe sed command can be used to reverse text. This is a very interesting feature. Provide a text string, and it will be reversed. jason@jason-Virtual-Machine:~$ sed ‘/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/./Hello. /’ <<< ‘This is a long sentence in reverse. This is a lot of fun.’ Hello. .nuf fo tol a si sihT .esrever…
Read MoreHow to get just the adapter name when querying the adapter with ip a. This is a simple trick, this one-liner is not that elegant, but it does work. This allows me to get just the name of the adapter, and not any other extraneous information. 4.4 Wed Aug 07…
Read MoreA Linux system can have a lot of users in the /etc/passwd file. But it is easy to keep track of your users with the command line. The lslogins command will print a listing of known users on your Linux system. An example of the usage. jason@jason-Virtual-Machine:~$ lslogins UID USER…
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