Password visibility on command line

I'm a bit paranoid about the fact that we are running a check that puts the password in plain text on the command line and would like to hide/obfuscate it.

The easiest way I can think is to have a JSON/XML/INI file with a user/password field in it into the nagios etc directory or somewhere similar then the script would just read them from there.

Has any thought been put into this kind of option?
