- 1 General
- 2 Network Tricks
- 3 Gnome tricks
- 4 Create ebook from a website using Calibre
- 5 X Window system tricks
- 6 VirtualBox tricks
Offline dictionary - GoldenDict
Install the GoldenDict dictionary application for your Linux distribution.
By default, the application only seems to use online dictionaries for English to English dictionaries.
Download the free offline dictionary Wordnet3 from here.
Unzip the downloaded file and place the file that ends with .dz in /usr/share/dictd
Now open GoldenDict. Go to Edit -> Dictionaries (or press F3). Under the Sources -> Files, you'll see the directories that GoldenDict looks for dictionary files. Press the "Rescan now" button in the right pane to index the newly added dictionary.
Optional: You can also make WordNet3 the dictionary with the highest priority by dragging it to the top in the Dictionaries tab.
Connecting to two networks - one Wi-Fi and one wired
Wi-Fi network has internet, wired does not. Then, disable the gateway of the Wired network for internet access.
Show the networks
$ ip route show
Smaller metric number means higher priority for the gateway
Remove the gateway of the wired network
$ sudo ip route del default via 192.168.1.1
chroot into a Raspberry Pi
mount /dev/sdb3 /mnt mount /dev/sdb2 /mnt/boot mount /dev/sdb1 /mnt/boot/firmware mount -o bind /proc /mnt/proc mount -o bind /sys /mnt/sys mount -o bind /dev /mnt/dev mount -o bind /dev/pts /mnt/dev/pts cp /usr/bin/qemu-arm-static /mnt/usr/bin chroot /mnt
Doing stuff in chroot
Example: Fixing a broken apt install
dpkg --configure -a apt -f install exit
umount /mnt/dev/pts umount /mnt/dev/ umount /mnt/sys umount /mnt/proc umount /mnt/boot/firmware umount /mnt/boot/ umount /mnt
Creating a desktop launcher on Gnome
sudo apt-get install --no-install-recommends gnome-panel
Open the Create Launcher dialog and enter the details for the launcher
sudo gnome-desktop-item-edit --create-new /usr/share/applications
Trimming a video
ffmpeg can be used to trim a video from a given start time to end time.
ffmpeg -i video.webm -ss 00:00:00 -t 00:05:04 -async 1 video-cut.webm
Create ebook from a website using Calibre
Some free books on the internet are available as HTML pages.
An epub file is simply an archive of HTML pages that can be treated as an ebook.
A book website can be stitched into an ebook using
wget -r --no-parent http://www.hpmor.com/ ebook-convert index.html hpmor.epub
X Window system tricks
Switch to Colemak layout in X window system
setxkbmap us -variant colemak
Run the following command, then logout and login.
echo "pointer = 1 2 3 5 4 6 7 8 9 10 11 12" >> ~/.Xmodmap
Adding a new virtual USB disk to a virtual machine
- Enable USB controller for the virtual machine. This can be done from the VirtualBox UI.
- Create a new virtual disk and add it using the USB controller.
- Run this command as root inside the box.
# mkfs.ext4 /dev/sdb