Reading a large text file and then finding all words that contain between 5 and 7 vowels. Notice I am not using cat. jason@Yog-Sothoth:~/Documents$ egrep ‘^([^aieou]*[aieou]){5,7}[^aieou]*$’ < pg768.txt | wc -l 284jason@Yog-Sothoth:~/Documents$ egrep ‘^([^aieou]*[aieou]){5,7}[^aieou]*$’ < pg768.txt | wc -l 284 Count the number of times a single word appears in…
Read MoreTo get information about Linux users with the shell, give these examples a go. Get a listing of all /home folders on Linux. jason@Yog-Sothoth:~/Documents$ sudo gawk -F: ‘{ print $6 }’ /etc/passwd | grep /home /home/syslog /home/jason /home/justin /home/danieljason@Yog-Sothoth:~/Documents$ sudo gawk -F: ‘{ print $6 }’ /etc/passwd | grep /home…
Read MoreLinux configuration files Here are a few useful Linux configuration files to get your installation setup and working just fine. ~/.vimrc. This is to setup the VIM editor and make it easier to use for the average Linux user. " ~/.vimrc (configuration file for vim only) " skeletons function! SKEL_spec()…
Read MoreEmulate a Polaroid photo with the imagemagik package on Linux. convert lifeinCanberra_bg.jpg -polaroid 0 house.jpgconvert lifeinCanberra_bg.jpg -polaroid 0 house.jpg This is the original image. https://www.asis.gov.au/media/Images/Rebrand/lifeinCanberra_bg.jpg. And this is the image after manipulation. Double the size of an image, while retaining relatively good image quality. convert missile.jpg -magnify missilebig.jpgconvert missile.jpg -magnify…
Read MoreHow to change your Ubuntu password as a normal user. jason@Yog-Sothoth:~$ passwd Changing password for jason. (current) UNIX password: Enter new UNIX password:jason@Yog-Sothoth:~$ passwd Changing password for jason. (current) UNIX password: Enter new UNIX password: Just enter you current password and then enter a new one twice. It is that…
Read MoreThis is how to have a custom lecture appear each time a user executes the sudo command to remind them to be careful with it. Run the visudo command as root and add these lines to the /etc/sudoers file. Defaults lecture="always" Defaults lecture_file="/home/jason/lecture"Defaults lecture="always" Defaults lecture_file="/home/jason/lecture" Then create the /home/jason/lecture…
Read MoreThe gvfs service on your system records metadata about your computing activity, I will be showing you how to stop the system recording your recently used files and applications. The file in question is in the ~/.local/share/ directory. Here is a snippet. ~/.local/share/recently-used.xbel~/.local/share/recently-used.xbel This is an XML files that contains…
Read MoreSecuring your website against online attacks is very important. There are many online tools and distributions like Backtrack and Kali that have mass-scanning tools to use against a website. Below is what a mass-scanning attack on a website looks like. This is searching for vulnerable scripts on an Apache website….
Read MoreThe best way to take a screenshot of an area of your screen is with a GUI application. Flameshot is one that is very good at doing this, and offers many tools to manipulate the image before saving. Install Flameshot easily. jason@Yog-Sothoth:~$ sudo apt install flameshotjason@Yog-Sothoth:~$ sudo apt install flameshot…
Read MoreIt is very easy to create a loopback filesystem in your home directory. This can be used to store files, or can be enabled as a swap partition. Firstly, run this command to create a blank file-system image. This will be 524 megabytes. jason@Yog-Sothoth:~/Documents$ dd if=/dev/zero of=myimage.img bs=1024 count=524288jason@Yog-Sothoth:~/Documents$ dd…
Read MoreGet a comprehensive listing of all Arch Linux pacman mirrors. curl -s -L "https://www.archlinux.org/mirrorlist/?country=all&protocol=https&use_mirror_status=on" 2>&1 | sed ‘s/^.//’ > mirrorlistcurl -s -L "https://www.archlinux.org/mirrorlist/?country=all&protocol=https&use_mirror_status=on" 2>&1 | sed ‘s/^.//’ > mirrorlist A simple script to update your mirror listing on your Arch Linux system. #!/bin/bash echo "Fetching new sorted mirrorlist…" curl -s…
Read MoreIt is very simple to show a banner to your users, that explains the terms of use for an SSH connection upon the user reaching a login prompt. Firstly, create a file named info in the /etc/ssh directory. sudo touch /etc/ssh/infosudo touch /etc/ssh/info Then put this in it. *************************************************************************** NOTICE…
Read MoreHow to list all symlinks in a Linux directory To list only the symbolic links on a Linux filesystem, use ls and grep as shown below. This will easily do this for you. ubuntu ~/Documents $ ls -hula /lib | grep "\->" lrwxrwxrwx 1 root root 21 Feb 4 02:48…
Read MoreTo encode a section of a movie file to a high-quality webm file, use this simple addon for mpv. Firstly run this command to create a directory to put the lua script. mkdir -p ~/.config/mpv/scriptsmkdir -p ~/.config/mpv/scripts Then download the required script to the directory we created. This is located…
Read MoreTo get proper directory indexing set up in a directory in your Apache webserver configuration, firstly, create a .htaccess file and paste the code below into it. Options +Indexes HeaderName HEADER.html ReadmeName FOOTER.html IndexIgnore .htaccess .??* *~ *# HEADER* FOOTER* README* RCS CVS *,v *,t *.incOptions +Indexes HeaderName…
Read MoreThere is a simple way to dump the contents of a virtual console to a file, the screendump command is the best way to achieve this. ubuntu ~ $ sudo screendump Ubunt * Stopping System V runlevel compatibility [ OK ] u 14.0 * Starting execute cloud user/final scripts […
Read MoreManaging your user account on Ubuntu or Linux Mint is very easy with the GUI utilities provided. Under System->Administration->Users and Groups, you have the option to create new user accounts, or modify existing ones. This is the window above, it is ready for the creation of new user accounts. Click…
Read MoreGetting a lot of useful information about a hard disk drive is easy with Linux. The smartmontools package contains utilities to retrieve a lot of very useful info. Firstly, install this package. jason@Yog-Sothoth:~$ sudo apt install smartmontoolsjason@Yog-Sothoth:~$ sudo apt install smartmontools Then run the command with sudo to get info…
Read MoreYour Linux user account details may be seen with the finger command, i.e finger jason. But the user can add more information to this as well. Create a file in your home directory named .plan and put this into it. ***************************************************************************^M NOTICE TO USERS This computer system is…
Read MoreTo open an xterm window over the network from another computer, use this command. This will open an SSH connection to another machine. Once the password is given, it will open a rxvt window which will appear on your machine and enable you to issue commands. jason@Yog-Sothoth:~$ ssh -YC [email protected]…
Read More