Unix/Linux — Swap Ctrl and Caps Lock in X11

In order to swap the Ctrl and Caps Lock keys in X11, you can add the following line in Section “InputDevice” of file /etc/X11/xorg.conf:

Option “XkbOptions” “ctrl:swapcaps”

If you woud like to keep the Ctrl where it is and make Caps Lock act as a Ctrl also, you can add:

Option “XkbOptions” “ctrl:nocaps”

Unix/Linux — generate large file

In order to generate a large file of a set size you can use:

dd if=/dev/zero of=test100M.bin bs=100000000 count=1

where of is the output file and bs is its size in bytes.