I wrote a loop in dash which waits for a file to appear in a certain location on the filesystem. But when it runs it takes up 50% of the CPU. I first lowered the CPU usage using a sleep command but the minimal sleep time in dash (1 second) is too long for me.
I need a way to sleep less than 1 second in bash or a different solution to lower the CPU usage of the loop. I only want to use programs that are installed by default on the most unix systems.
On my Linux system, I can simply do
$ sleep 0.1
and it sleeps for 0.1 seconds. The sleep here lives in /usr/bin/sleep. I don't know which other unix-like systems support that, though.