Mention bash scripts

Author: Esteban82

docs/tutorials/advance/animation.rst

@@ -65,7 +65,7 @@ For the purposes of this tutorial, I define two types of animations that can be
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 - GMT version 6.5 or later.
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+- Bash scripting environment: The examples in this tutorial are written in Bash and may not work correctly in other shell environments (e.g., zsh, fish, or Windows cmd).
 
 2. Tutorial 1. Earth spinning
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