sleep
From NetBSD Wiki
sleep seconds
The sleep(1) utility suspends execution for a minimum of seconds. It is usually used to schedule the execution of other commands (see examples below).
Note: The NetBSD sleep command will accept and honor a non-integer number of specified seconds. This is a non-portable extension, and its use will nearly guarantee that a shell script will not execute properly on another system.
Examples
% sleep 1 % sleep 2.5 % sleep 4.09
