paste current time into active window, works in linux

pasteCurrentTime.sh

dateString=$(date +"%Y-%m-%d")
timeString=$(date +"%H:%M:%S")

content="-- [ $dateString ] [ $timeString ] --"

# Preserve the current value of the clipboard
clipboard=$(xsel -b -o)

# Put text in primary buffer for Shift+Insert pasting
echo -n "$content" | xsel -p -i

# Put text in clipboard selection for apps like Firefox that 
# insist on using the clipboard for all pasting
echo -n "$content" | xsel -b -i

# Paste text into current active window
sleep 0.3
xdotool key shift+Insert

# Restore the original value of the clipboard
sleep 0.5
echo $clipboard | xsel -b -i