time output does not shows anything

[inv2004]

[n-st]

Strange… What distribution (and version) are you running this on? What do type time and which time output in your /usr/bin/env bash?

[inv2004]

You are right. Looks like it is internal keyword. It is on scaleway and oracle-cloud hostings.
I think it is ubuntu, but very minimal image

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
Codename:       focal
$ type time
time is a shell keyword
$ which time
$

$ time ls >/dev/null 2>&1

real    0m0.001s
user    0m0.001s
sys     0m0.000s
$ time | cat
bash: syntax error near unexpected token `|'

[inv2004]

I did some investigation and look like the root cause is here: https://en.wikipedia.org/wiki/Time_(Unix)
It also ignores pipeline redirections

and another reason is that I was too lazy to chmod the file and run it simple sh nench.sh (which is dash) and it caused the problem

I just rechecked it with bash nench.sh - and it works fine.

[n-st]

Yeah, that would do it. I usually try to keep my scripts within POSIX, but this one definitely requires bash to make the output reformatting less cumbersome.