Bash sleep in milliseconds

Question

I need a timer which will work with milliseconds. I tried to use sleep 0.1 command in a script, but I see this error message:

syntax error: invali

Answer 1

Bash was complaining about decimal values,

read: 0.5: invalid timeout specification

I came around with this solution which works great.

sleep_fraction() {
  /usr/bin/perl -e "select(undef, undef, undef, $1)"
}

sleep_fraction 0.01428