/lib/udev/keyboard-force-release.sh is in udev 175-0ubuntu9.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #!/bin/sh -e
# read list of scancodes, convert hex to decimal and
# append to the atkbd force_release sysfs attribute
# $1 sysfs devpath for serioX
# $2 file with scancode list (hex or dec)
case "$2" in
/*) scf="$2" ;;
*) scf="/lib/udev/keymaps/force-release/$2" ;;
esac
read attr <"/sys/$1/force_release"
while read scancode dummy; do
case "$scancode" in
\#*) ;;
*)
scancode=$(($scancode))
attr="$attr${attr:+,}$scancode"
;;
esac
done <"$scf"
echo "$attr" >"/sys/$1/force_release"
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