Linux usleep: command not found, Why?

as Tcampbell already wrote it should be in initscripts

you can type

ls -al /bin/usleep
rpm -qV initscripts 

to see if something happened with your usleep

if its not there i would suspect that there is a serious disk error or the machine has been broken into


What distribution? On my RHEL 5 system, usleep is part of the initscripts RPM.