The question is Do you want protection against a random program, a specific program, or a human user with physical access to your computer.
The solution to your issue can be different, depending on the answer to the question. 
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What is @$ doing here?
This loads all arguments from your input in terminal.
You can test that $@ is removed and then run your custom shell script $ /usr/local/bin/ip addr show, you will understand what happens.
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