How do I sleep for a millisecond in bash or ksh

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http://serverfault.com – sleep is very popular command and we can start sleep from 1 second # wait one second please sleep 1 but what the alternative if I need to wait only 0.1 second or between 0.1 to 1 second ? remark: on linux sleep 0.XXX works fine , but on solaris sleep 0.1 or sleep 0.01 - not illegal syntax yael (HowTos)