Cannot find nginx.conf using passenger-nginx and rbenv

Question

I recently created a Linode server with Ubuntu 12.04 LTS

as the admin user aurelien I installed rbenv (in my case 1.9.3-p194 for my older rails 3.2 app).

Afterwhich I ran gem install passenger and was placed in the directory ~/.rbenv/shims

After that I ran rbenv rehash

and to install nginx:

I couldn't run passenger-install-nginx-module because it asked to use with sudo. When I tried sudo passenger-install-nginx-module it told me command not found.

Then I found this post PhilT's answer

and tried running sudo bash -c "source ~/.bashrc && passenger-install-nginx-module"

/home/aurelien/.rbenv/shims/passenger-install-nginx-module

I went through the entire passenger/nginx installation and pressed "enter" when it asked for the prefix directory.

in my root directory cd ~/home/aurelien and I can't find /opt/nginx.

Did it correctly create these directories?

The only directories/files I have on the root are these:

.  ..  apps  .bash_history  .bash_logout  .bashrc  .cache  .gem  .gitconfig  .profile  .rbenv  .ssh  .viminfo

EDIT: My .bashrc file

export RBENV_ROOT="${HOME}/.rbenv"

if [ -d "${RBENV_ROOT}" ]; then
  export PATH="${RBENV_ROOT}/bin:${PATH}"
  eval "$(rbenv init -)"
fi


# If not running interactively, don't do anything
[ -z "$PS1" ] && return

Answer 1

The answer posted before by PhilT had the correct code for installing nginx together with passenger:

gem install passenger rbenv rehash sudo bash -c "source ~/.bashrc && passenger-install-nginx-module"

The fault in your explanation above is that /opt/nginx is not in user's home directory (~/home/aurelien/opt/nginx), but in the root directory (plainly /opt/nginx.), as nginx is a system-wide install.

(Note: In some other systems nginx also has config files placed in /etc/nginx instead)