bup-tick man page
bup-tick — wait for up to one second
bup tick waits until time(2) returns a different value than it originally did. Since time() has a granularity of one second, this can cause a delay of up to one second.
This program is useful for writing tests that need to ensure a file date will be seen as modified. It is slightly better than sleep(1) since it sometimes waits for less than one second.
$ date; bup tick; date Sat Feb 6 16:59:58 EST 2010 Sat Feb 6 16:59:59 EST 2010
Part of the bup(1) suite.
Avery Pennarun <email@example.com>.