Installing RVM with a specific bash command format using `-s`

Question

I'm trying to install RVM via bash. According to the installation guide on rvm.io, the command to do that is:

\curl -sSL https://get.rvm.io | bash -s stable --auto-dotfiles

I'm, however, compelled to download the script and then run it separately. So, my bash command would attempt to execute the downloaded file (let's call it rvm-installer).

How can I execute rvm-installer using the format below:

/bin/bash -c './rvm-installer 2>&1'

Obviously, the above command is incorrect. I'm thinking it should look more like this:

/bin/bash -s stable --auto-dotfiles './rvm-installer 2>&1'

I know the above command sets my positional parameters in the correct order because of this:

$ printf "%s\n" "$@"
stable
--auto-dotfiles
./rvm-installer 2>&1

and this:

$ echo "$SHLVL"
2

But I'm confident that rvm-installer is not running because I replaced its contents with the following, to test but once the command above is run, I see no output:

#!/usr/bin/env bash

gimme a syntax error
echo "$1"
echo "Foo bar"
exit 1

How can I run rvm-installer using -s within the bash command format I need to use? Is there a way around using -s?

Answer 1

-s is a bash argument not an rvm-installer argument.

The other arguments are the rvm-installer arguments.

So just pass those to rvm-installer yourself.

./rvm-installer stable --auto-dotfiles

Using the, entirely pointless, explicit call to bash that would look like this

/bin/bash -c './rvm-installer stable --auto-dotfiles 2>&1'

though that could just as meaningfully be this as well

/bin/bash rvm-installer stable --auto-dotfiles 2>&1