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Editorial Team
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Editorial Team
Asked: May 29, 20262026-05-29T21:12:44+00:00 2026-05-29T21:12:44+00:00

I named a Ruby file app.py and it worked. I only noticed later. Why

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I named a Ruby file app.py and it worked. I only noticed later. Why is that possible. It wasn’t anything complicated, just a small Sinatra recipe but still, I don’t understand.

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  1. Editorial Team
    Editorial Team
    2026-05-29T21:12:45+00:00Added an answer on May 29, 2026 at 9:12 pm

    Under Unix (say, Linux or similar), the first line of a script contains the path to its interpreter. The line’s called Shebang or Crunchbang and looks like that:

    #! /usr/bin/ruby

    If you rename you file, the path to the interpreter still remains unchanged and therefore the script will be executed as before.

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