How to determine how much time a command takes to finish?

Question

I am writing a shell script in abc.sh

echo $(date)
openssl aes-256-cbc -a -salt -in abc.zip -out abc.zip.enc 
echo $(date)

It is showing the time at both start and end of the process, but I want the exact amount of time taken to complete such process.

What do you mean with original time only for encryption ? – M. Becerra May 08 '17 at 10:10 — M. Becerra, May 08 '17 at 10:10
yes original time only for encryption @M.Becerra – prasanna May 08 '17 at 10:58 — prasanna, May 08 '17 at 10:58

score 3 · Accepted Answer · edited May 08 '17 at 10:37

3

Use time command before your command:

time command

What does it do?

time (1) - run programs and summarize system resource usage

For your situation:

time openssl aes-256-cbc -a -salt -in abc.zip -out abc.zip.enc

It will output something like:

real    0m2.199s
user    0m0.008s
sys     0m0.008s

The time in user section is what you are looking for, the time that user space worked on your process.

The sys is related to kernel and the real is what you are getting right now with your echo solution, your clock time from running to the end with the time you spend for entering the password.

edited May 08 '17 at 10:37

muru

197,895
55
485
740

answered May 08 '17 at 10:10

Ravexina

55,668
25
164
183

When I try to execute the time before opnessl is mismatching with time displayed with date , then how to do ? – prasanna May 08 '17 at 11:29
1

@prasanna How do you define mismatching? Can you provide an example of the values you get? – phihag May 08 '17 at 11:36
@prasanna Yeah, as phihag said provide what are you getting as output in both commands so we can see what is going on. – Ravexina May 08 '17 at 13:37
i got correct answer i confused sorry friends – prasanna May 08 '17 at 16:20

How to determine how much time a command takes to finish?

1 Answers1