Is there anything that can help me launch an app or command-line tool without internet or network access even when I'm connected to the internet? (so that I can use other apps with Internet, and block access for some apps) Like a firewall? Or something that intercepts the syscalls, something like maybe?

  • All applications and command line tools (e.g. TextEdit.app, cp) can start without Internet access. However, the github link seems to simulate the --dry-run option on rsync, but your question asks for "starting things while not connected to the Internet". You may wish to edit your question to make it a bit clearer. Commented Feb 17, 2016 at 11:01
  • @perhapsmaybeharry Done.
    – Elmo
    Commented Feb 17, 2016 at 17:33

1 Answer 1


It seems that what you're looking for would be Little Snitch. You can find out more about it and download it here.

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