IONCUBE PHP.ini file retrieval ? Please help me!

I need to EDIT my PHP.ini file under 1 username so that same script can work on 3 domains. How can I access & download this PHP.ini file? I already contacted DreamHost Support but they cannot help me on this and told me to ask you guys on this forum.

I tried to enter command from my FTP client Filezilla
cp /etc/php5/cgi/php.ini $HOME/

but I got

Command: cp /etc/php5/cgi/php.ini
Response: 500 CP not understood

THE CGI-BIN directory does not show up anywhere in the root or any other folders and especially this php.ini file.

PLEASE HELP ME GUYS I Just need to put few lines of code for IONCUBE to connect with my other 2 domains.

PS: I even logged in using SHELL account. My username is also SHELL in control panel. still nothing shows up.

See link below.

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How To Install PHP.INI / ionCube on DreamHost