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RedHat 9 (Linux i386) - man page for usleep (redhat section 1)

USLEEP(1)						      General Commands Manual							 USLEEP(1)

NAME
usleep - sleep some number of microseconds
SYNOPSIS
usleep [number]
DESCRIPTION
usleep sleeps some number of microseconds. The default is 1.
OPTIONS
--usage Show short usage message. --help, -? Print help information. -v, --version Print version information.
BUGS
Probably not accurate on many machines down to the microsecond. Count on precision only to -4 or maybe -5.
AUTHOR
Donald Barnes <djb@redhat.com> Erik Troan <ewt@redhat.com> Red Hat, Inc USLEEP(1)