sudo: nginx : command not found

I've sshed to a remote vm and have built nginx from source and it works fine.

nginx installation path is /usr/local/nignx/sbin which has been added to both /home/my-username/.bash_profile and /root/.bash_profile; I've logged out sudo pkill -u $USER and ssh connected again.

so far I have bochen> which nginx returns /usr/local/nginx/sbin/nginx

sudo -i then root# which nginx returns: /usr/local/nginx/sbin/nginx

but bochen> sudo nginx return command not found

I don't understand what is going on...

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