Data pump command

Hi All -

We have a data pump script that will be taking the password via command line variable/positional parameter. I've seen there are other ways of doing this ... password file, etc. But, as it stands, this is the approach that will be taken, as this will be incorporated a larger batch process and run via 3rd party tool.

My understanding is that it may be possible to see the password by running the PS command from the OS. I have also heard/read that it may be possible to avoid this by piping the password to the impdp command? I've looked around the web, but am not seeing concise results for this.