Finding out how long a program takes to execute
 

Is there any command in Linux that I can use to measure the execution time (in milli or micro seconds) of a program?

time? :)

You want time outside or inside the program?

If inside, read the docs for whatever programming
language you're using. I know there are docs for
g77, gcc, and g++. I don't know what programming
languge you are using. For example, in fortran,
you define an array, say INTEGER tick(2), then
use etime, dtime, or wahtever to find the time
of a particular program section. I'm sure there are
similiar stuffs for other languages.

If outside, use a script w/ time before and after
the program, i.e.,

#/bin/sh
time
<your program>
time

Sheng-Chieh