Bash: Calculate how long it takes a script to run

Question

Is there a way to have a bash script to print how long it took to run?

Something fairly simple like:

#!/bin/bash
something to start time
command to be run
something to calculate runtime and print result

Answer 1

There is the standard tool time.

The script:

#!/bin/bash

echo start
sleep 2
echo end

Usage:

$ time ./so.sh       
start
end
./so.sh  0.00s user 0.01s system 0% cpu 2.007 total

Answer 2

You can use the time command:

time - run programs and summarize system resource usage

For example:

time <command>

Will give you the execution time of your commands