06-05-2014
The answer to how that program work are in the URL you linked.
The called program overwrites it's arguments after making a copy of them. But as one of the other comments adds, there's still a brief period of time when the commands arguments are visible so it's not foolproof.
The only way to make sure information you want to remain private isn't exposed as a command argument is to either encrypt it first, or to have the calling and called program communicate the info some other way. You could use a file, shared memory, IPC, a pipe, etc...
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