Morse Code or CW generator using speaker-test in linux [dirty hack]

cw-speaker-test.sh

#!/bin/sh

# speaker-test is not designed for this.. you could make this longer but
# making it shorter just won't work due to silly way I am doing this.
long=0.2
short=0.1
lspace=0.3
wspace=0.5


# letter space
lspace() {
	sleep $lspace 
}

# word space
wspace() {
	sleep $wspace
}

long() {
	speaker-test -t sine -f 600 1> /dev/null & sleep $long && kill -9 "$!"
}

short() {
	speaker-test -t sine -f 600 1> /dev/null & sleep $short && kill -9 "$!"
}

# TU 5NN 73

long
lspace
short
short
long

wspace

short
short
short
short
short
lspace
long
short
lspace
long
short

wspace

long
long
short
short
short
lspace
short
short
short
long
long