[tingol]

You can do sleep 15m; beep

[duaneb]

One of the reasons to use this is to avoid beep, which may not even be enabled on your machine.

[tingol]

Use echo '\a' that's what this program uses anyway... It's literally sleep $1; echo '\a' or you can use at if you want exact time.

[michaelcampbell]

Yes, anything can be done in a different way.

[swiley]

X11 bell almost never works for me.