time [man page] - run programs and summarize system resource usage
time [ -apqvV ] [ -f FORMAT ] [ -o FILE ]
[ --append ] [ --verbose ] [ --quiet ]
[ --portability ] [ --format=FORMAT ]
[ --output=FILE ] [ --version ]
[ --help ] COMMAND [ ARGS ]
Measure time for running program time itself:
$ time

Measure execution time of "find" command and redirect stderr to /dev/null:
$ time find / -name resolv.conf 2>/dev/null
