This script (quoted below) worked for me. No need for terminal whatsoever:
How to fix Adobe Flash issue on Mac OS X 10.5.8 with
allow-outdated-plugins switch and restore Chrome functionality
(step-by-step screen shots included):
Step 1. In Finder goto the Finder pull-down menu -> Services -> Script
Editor -> Make New AppleScript
Step 2. Copy/Paste the following into Script Editor:
do shell script "/Applications/Google\\
Chrome.app/Contents/MacOS/Google\\ Chrome --allow-outdated-plugins &
killall ChromeScript.app"
Step 3. Goto File -> Save As -> **FILENAME: ChromeScript (File Format:
select "Application"; Options: make sure only "Run Only" is checked)
**BE SURE TO NAME YOUR FILE ChromeScript FOR THE APPLESCRIPT TO WORK CORRECTLY
From now on you will use your new ChromeScript app to open Chrome. You
can also replace your "old" Chrome icon in your launch bar with the
new script for convenience. Remember to manually update your plugins
once in a while because Chrome will no longer do it automatically.
Could you tell me how you run terminal though? It did not work no matter how I ran commands, so I'm just curious.