Linux Shell send text to another tty terminal

#redirecting output to another tty (teletype) or pts (pseudo-teletype)

#find out who is logged onto which terminal
who -a

#now send text to that terminal
echo "Hello World" > /dev/tty1
#or
echo "Hello World" > /dev/pts/1

#or send something more fun
sudo apt install cmatrix fortune cowsay
cmatrix > /dev/pts/2
cowsay "Hello There" > /dev/pts/2
fortune > /dev/pts/2
cowsay "$(fortune)" > /dev/pts/2
fortune|cowsay -f tux > /dev/pts/2