Thanks to arox and my bad : I was trying to use some full version's option in the built in version of time.
No need to install time, it's done in armbian, just give the full path\command :
root@Bpi2+:~# time -f
-f: command not found
root@Bpi2+:~# which time
root@Bpi2+:~# /usr/bin/time -f
/usr/bin/time: option requires an argument -- 'f'
Usage: /usr/bin/time [-apvV] [-f format] [-o file] [--append] [--verbose]
[--portability] [--format=format] [--output=file] [--version]
[--quiet] [--help] command [arg...]
root@Bpi2+:~# /usr/bin/time -f "%E" curl www.orange.fr
In such case type "type time" and the shell will inform you (is a shell keyword").
Thank You again I wanted to script some test and collect the results and this format is useful for this.
My next step is to remove the ':' in the output (is not trivial to combine 'time' and pipe without writing the output in a file, may be I have to try something else).
Be patient I can only write one post/day....
It's nice to have so small SBC and so large facilities and community. Thank You Armbian !
@Werner & @Igor Thank You for replying (maybe too fast ?) but You are wrong when You think that I did'nt red the man pages ... it was more complex.