Answer to chapter 6 question 3
Use at to schedule the alarm call by giving it
argument now + 1 hour. Remember that at
will mail you the standard output from the
commands you give it, so you must send the message directly to the
device which is your terminal. You can find out the device name
using tty:
$ tty
/dev/ttypf
$ at now + 1 hour
at> echo "Your alarm" >/dev/ttypf
at> ctrl-D
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