How to ignore program's output when using /usr/bin/time?

Question

I want to know how long a program running, so I tried \"/usr/bin/time ./program > /dev/null\". But soon I found it displays program\'s output to stderr. I tried \"/usr/bin/t

Answer 1

(Unable to comment)

It might be nicer to use a subshell:

/usr/bin/time ( ./program > /dev/null 2>&1 ) 2>&1

Or better yet a compound construct:

/usr/bin/time { ./program > /dev/null 2>&1; } 2>&1