Created SC2187 (markdown)

SC2187.md

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+## Ash scripts will be checked as Dash. Add '# shellcheck shell=dash' to silence.
+
+### Problematic code:
+
+```sh
+#!/bin/ash
+echo "Hello World"
+```
+
+### Correct code:
+
+```sh
+#!/bin/ash
+# shellcheck shell=dash
+echo "Hello World"
+```
+### Rationale:
+
+ShellCheck has no first class support for `ash`, but it does support its Debian fork `dash` and defaults to this whenever `ash` is specified.
+
+You can use a [[directive]] to let shellcheck know you're aware of this.
+
+### Exceptions:
+
+None.