usleep sleeps some number of microseconds. The default is 1.
usleep has been deprecated, and will be removed in near future. Use sleep(1) instead.
--usage Show short usage message.
- --help, -?
Print help information.
- -v, --version
Print version information.
Probably not accurate on many machines down to the microsecond. Count on precision only to -4 or maybe -5.
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