This command will capture a screenshot of the desktop and save it to the home directory. jason@neo:~$ import -window root "$HOME/$(date ‘+%y%m%d_%T’).png"jason@neo:~$ import -window root "$HOME/$(date ‘+%y%m%d_%T’).png" This is how to do this with the scrot utility. jason@neo:~$ scrot Desktop-%H:%M:%S-%d-%m.jpgjason@neo:~$ scrot Desktop-%H:%M:%S-%d-%m.jpg Characters preceded by a ‘%’ are interpreted by strftime(2). See man strftime for … Read more
To print a graphical notification from a shell script, insert this code. notify-send "Match Found!"notify-send "Match Found!" This will pop up a notification on your desktop, this will alert you to the fact that your shell script has done something. Make your computer talk. This will speak whatever you type as text. jason@jason-desktop:~$ espeak "I … Read more
Search and replace on the bash shell is very useful for various one-liner shell commands. The below example shows how to replace a # character with a * character. jason@DESKTOP-R72SPS3:/mnt/c/Users/johnc/Documents$ cat ip.c | sed ‘s/#/*/gi;’ *include <stdio.h> int main() { printf("."); return 0; }jason@DESKTOP-R72SPS3:/mnt/c/Users/johnc/Documents$ cat ip.c | sed ‘s/#/*/gi;’ *include <stdio.h> int main() … Read more
The grep command on Linux is very good for filtering text to find certain strings. This is mostly used for filtering the output of a command to narrow down what the user is looking for. Find all instances of a word in a text file. jason@DESKTOP-R72SPS3:/usr/share/X11$ grep "dark" rgb.txt 47 79 79 dark slate gray … Read more
How to upgrade to a newer Linux Mint release. https://community.linuxmint.com/tutorial/view/2. How to update and upgrade your packages. Type this in a terminal window. sudo apt-get update && sudo apt-get upgradesudo apt-get update && sudo apt-get upgrade This command will update the package repositories and download and install package updates over the Internet. Find a nice … Read more
Creating your own logo for your company which needs to make its debut on the internet is a challenge which can be met. When it responds positively to your mission, the rewards can be exponential in more ways than one. To get your creative juices flowing and to begin to answer your predictable question of … Read more
When in command mode, press the u key to undo the last change to a file. Press U to undo last change(s) on a line. To open a file at a certain line, start it like this: vim +567 file.txt. This will open the file file.txt on line 567. Using the VIM editor for Linux … Read more
To open the Firefox developer tools, press Ctrl-Shift-K. This is good if you have Firebug installed, as F12 will open it instead. To take a full-page screenshot of a web site, press Shift-F2 and then type this command and hit press ENTER. screenshot –fullpagescreenshot –fullpage This will be saved in the ~/Downloads folder by default. … Read more
Damn Vulnerable Web App is a PHP web application that is deliberately vulnerable. This is used to learn how to attack websites by exploiting various vulnerabilities in the software. In this example, I am showing you how to use an SQL injection attack to get information out of the database. This line of code will … Read more
To open a new virtual terminal to enter commands, use the Ctrl-Alt-F2 key combination and enter your username and password. This is a virtual terminal where you can control your system with a distraction free full-screen terminal. There are key combinations to switch between virtual terminals, read more here: http://www.tldp.org/LDP/GNU-Linux-Tools-Summary/html/virtual-terminals.html. To get a version of … Read more
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 … Read more
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 0.14Last 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 … Read more
Using the shellshock bash bug on an iMac. iMac04:~ admin$ env VAR1=’me() {echo "hello"}\ ‘ /bin/echo "hello" helloiMac04:~ admin$ env VAR1=’me() {echo "hello"}\ ‘ /bin/echo "hello" hello Getting free hard disk space easily. iMac04:~ admin$ df -Hla Filesystem Size Used Avail Capacity iused ifree %iused Mounted on /dev/disk0s2 89G 64G 25G 73% 15757422 6089307 72% … Read more
Amazon Web Services is a very powerful way to run a virtualized server in the cloud, but there are some tips that will help you greatly when deploying a server for the first time. SSH access is one. Changing the SSH port from 22 to 443 in the /etc/ssh/sshd_config file will help access when you … Read more
The free command in Linux is used to show the amount of free memory in Linux. The example below shows the default usage of this command. ubuntu@ip-172-31-0-140:~$ free total used free shared buffers cached Mem: 602736 294680 308056 16928 17632 146320 -/+ buffers/cache: 130728 472008 Swap: 0 0 0ubuntu@ip-172-31-0-140:~$ free total used free shared buffers … Read more
If you are starting Firefox from a terminal window where you have specified the proxy settings, and you have the use system proxy settings option ticked, you will not need to set the proxy within Firefox. That is a very cool tip indeed. If you need to set the proxy before using apt, you will … Read more
This is how to automatically remove unneeded packages on your Linux Mint system. jason@jason-desktop:~$ sudo apt-get autoremove [sudo] password for jason: Reading package lists… Done Building dependency tree Reading state information… Done The following packages will be REMOVED: libglib2.0-0:i386 libgstreamer-plugins-base0.10-0 libgstreamer-plugins-base0.10-0:i386 libgstreamer0.10-0 libgstreamer0.10-0:i386 liborc-0.4-0:i386 libpgm-5.1-0 libpoppler57 libpth20 libsndio6.0 libzmq3 qtdeclarative5-qtfeedback-plugin qtdeclarative5-ubuntu-web-plugin 0 to upgrade, 0 … Read more
Some very useful Linux shell commands and tricks. Print numbers in sequence. [homer@localhost ~]$ seq 8 24 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24[homer@localhost ~]$ seq 8 24 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 … Read more
How to expand a VDI disk image on a Macintosh computer: http://mithunme.wordpress.com/2013/07/08/how-to-increase-the-disk-size-of-a-ubuntu-vdi-on-mac/. This would also be applicable to a Linux machine. A very useful tip. How to add a standard user to the /etc/sudoers file on a Macintosh computer: http://mithunme.wordpress.com/2013/02/10/adding-a-standard-user-to-etcsudoers-in-mac-os-x/. This is also applicable to a Linux machine. How to install World Of Warcraft on … Read more
http://www.securitronlinux.com/bejiitaswrath/lovely-gtk-themes-for-the-linux-mint-mate-desktop/. Some very useful and attractive themes and wallpapers for Linux Mint MATE and other desktops. http://www.securitronlinux.com/linux-mint-2/how-to-install-a-lovely-windows-7-gtk-theme-on-linux-mint-14/. How to install a Windows 7 Basic styled theme for the MATE desktop. http://www.securitronlinux.com/bejiitaswrath/windows-8-metro-ui-theme-for-metacity-available-make-your-linux-mint-mate-desktop-look-like-windows-8/. how to install a Windows 8 Metacity theme for the Gnome and MATE desktops. This one is really good. http://www.securitronlinux.com/linux-mint-2/disable-desktop-icons-on-the-linux-mint-13-mate-desktop-very-easy-with-the-configuration-editor/. how to disable the … Read more