Measure script execution time

Question

In Bash shell, is there a simple way for me to monitor the time taken to run a script and output the time taken?

Answer 1

Yes.

 time script

Where script is the script to monitor the time for.

For instance, time find ~ will output something like this (Depending on the size of your home directory, that is):

real    0m49.139s
user    0m0.663s
sys     0m4.129s

Answer 2

I made a tic/toc timer pair utility called ttic and ttoc. It's available here.

Example use:

$ ttic && sleep 0.4 && ttoc
0.405

To avoid conflicts with an existing tic/toc pairing, an ID can be specified, here foo:

$ ttic foo && sleep 0.5 && ttoc foo

Or assign a random ID, like so:

$ id=$(ttic --unique) && sleep 0.5 && ttoc $id

Answer 3

If you want to time a chunk of code, you can do:

> time { sleep 3; }
real    0m3.013s
user    0m0.002s
sys     0m0.006s