Explain that using shell functionality is forbidden. [skip ci]

mniestroj · Jul 5, 2019 · 785b071 · 785b071
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commit 785b071
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diff --git a/docs/markdown/Contributing.md b/docs/markdown/Contributing.md
@@ -304,3 +304,9 @@ line switches.
 - Prefer specific solutions to generic frameworks. Solve the end
   user's problems rather than providing them tools to do it
   themselves.
+
+- Never use features of the Unix shell (or Windows shell for that
+  matter). Doing things like forwaring output with `>` or invoking
+  multiple commands with `&&` are not permitted. Whenever these sorts
+  of requirements show up, write an internal Python script with the
+  desired functionality and use that instead.