How to get numeric keypad arrows working with java applications on Linux

 

From here 

Physical keys on a keyboard are mapped to key codes using xkb. Here's how I got numeric keys working with java applications (like Intellij) on a Debian derivative of Linux:

1. Switch to root user
2. cd /usr/share/X11/xkb/symbols
3. cp keypad keypad.original (just in case)
4. Edit keypad and replace all occurrences of KP_Up, KP_Down, KP_Left & KP_Right with Up, Down, Left & Right, respectively
5. Save
6. dpkg-reconfigure xkb-data
7. Reboot

Now the numeric keypad will emit the regular, arrow, key codes and not the java-unrecognised, numeric keypad, arrow, key codes.

Ibanez S521 guitar inside

 Ibanez S521 guitar

Inspector Mirage headless guitar - travel bridge

 Inspector Mirage headless guitar - travel bridge inside

Humbucking

 Humbucking

 

Linux exFAT file system

$ sudo apt install exfatprogs

$ sudo apt autoremove

$ sudo mkfs.exfat -L DDBAK /dev/sda2

$ sudo mkdir /mnt/bak

$ echo '/dev/sda2 /mnt/bak exfat defaults,nosuid,nodev,gid=24,fmask=0007,dmask=0007,uhelper=udisks2 0 0' | sudo tee -a /etc/fstab

$ sudo mount /mnt/bak/

$ mount | grep /dev/sda2

/dev/sda2 on /mnt/bak type exfat (rw,nosuid,nodev,relatime,gid=24,fmask=0007,dmask=0007,allow_utime=0020,iocharset=utf8,errors=remount-ro,uhelper=udisks2)

 

Linux swap file

$ sudo fallocate -l 8g /mnt/8GiB.swap

$ sudo chmod 600 /mnt/8GiB.swap

$ sudo mkswap /mnt/8GiB.swap

$ sudo swapon /mnt/8GiB.swap

$ cat /proc/swaps

$ echo '/mnt/8GiB.swap swap swap defaults 0 0' | sudo tee -a /etc/fstab

$ sudo reboot

$ free -h

Watch battery (Wenger)

371 - 9,5x2mm, 1,55V, 35mAh (V371, D371, 280-31, SB-AN, SR921, SR69, SR920SW)
370 - 9,5x2mm, 1,55V, 40mAh (V370, D370, 280-51, SB-BN, SR921, SR69, SR920W)