shell-write command problem - How to add a "key" to a plist file via terminal? (iphone,mobileterminal)

Question

I wanted to run this command in mobileterminal (iphone):

write "/myPlist.plist" TestKey "TestStringForKey"

but it says: 'write' command not found

The plist EXISTS!

What am I doing wrong?

Is there any other way?

EDIT: TestKey does not exist in the plist. I want to create it.

EDIT: Some infos: iPod Touch with iOS 4.2.1 and with the newest mobileterminal from googlecode.

EDIT: Now I installed "write". If I run the command i get this: usage: write user [tty]

Answer 1

I think you want the defaults command:

defaults write "myPlist.plist" TestKey "TestStringForKey"