$ sw; sleep 0.5; sw
Time elapsed: 0.516624176s

$ sw start
$ sw elapsed
1.441450445
$ sw stop

$ sw start
$ sw record
$ sw record Done
$ sw elapsed 1
1.562742693
$ sw elapsed Done
4.153111552
$ sw times
1    1.562742693 1.562742693
Done 4.153111552 2.590368859
$ sw stop

$ sw start
$ git clone -q https://github.com/mohd-akram/sw.git
$ printf 'Cloning took %.3f seconds\n' `sw -1 lap` >&2
Cloning took 1.815 seconds
$ cd sw
$ cargo build -q
$ printf 'Building took %.3f seconds\n' `sw -1 lap` >&2
Building took 1.016 seconds
$ sw stop