Created SC2216 (markdown)

SC2216.md

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+## Piping to 'echo', a command that doesn't read stdin. Wrong command or missing xargs?
+
+### Problematic code:
+
+```sh
+find . -type f | echo "Results: "
+```
+
+### Correct code:
+
+```sh
+find . -type f -print0 | xargs -0 echo "Results: "
+```
+
+### Rationale:
+
+You are redirecting to one of several commands that don't read from stdin.
+
+This may happen when:
+
+* Confusing one command for another, e.g. using `echo` where `cat` was intended.
+* Incorrectly refactoring, leaving a `|` on the previous line.
+* Missing `xargs`, because stdin should be passed as positional parameters instead (use `xargs -0` if at all possible).
+
+Check your logic, and rewrite the command so data is passed correctly.
+
+### Exceptions:
+
+If you've overridden a command to return output, you can either rename it to make this obvious, or [[ignore]] this message.