from http://d.hatena.ne.jp/penguin2716/20140114/1389725926

enter_keystroke.sh

#!/bin/bash -xe
base=`basename $0 | sed -e 's/\.sh$//g'`
cmd=`echo $base | awk -F '_' '{print $1}'`
keystroke=`echo $base | sed -e 's/^[^_]\+_//g'`

id=`xdotool getwindowfocus`

# Avoid chikachika-terminal
#app_name=`xprop -id ${id} | grep M_CLASS | cut -f3 -d ' ' |  tr '[:upper:]' '[:lower:]' | tr -d ',','"',' ',"\'"`
#if [ "$app_name" == "terminator" ]; then
#    exit 0
#fi

case $cmd in
key)
  xdotool key --window $id "$keystroke" > /dev/null 2>&1
  ;;
type)
  echo -n "$keystroke" | xclip -i -selection clipboard
  xdotool key --window $id "ctrl+v" > /dev/null 2>&1
  ;;
*)
	echo "usage: ln -s $0 {key|type}_<keystroke>.sh"
	exit 1;;
esac

Depends on https://gist.github.com/drobune/03fa1cb070409bc47928c62c5bb2b61b