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- Usage: timer [<milliseconds>]
- where <milliseconds> is the number of milliseconds to wait between
- printing newlines.
- If <milliseconds> is not given, wait times are read from the standard input.
- In this mode, timer waits until a time and newline have been read,
- waits for the specied interval, writes a newline, and then reads again.
- Multiple times can be given on a line, separated by newlines.
- If a bad time is read or the standard input is closed, timer exits.
- Note that on most systems, the clock period is at least 10 milliseconds.
- Time requests are silently rounded up to the next highest clock period.
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