Created SC2127 (markdown)

SC2127.md

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+## To use `${ ..; }`, specify `#!/usr/bin/env ksh`.
+
+(Or "To use cases with `;;&`, specify `#!/usr/bin/env bash`)
+
+### Problematic code:
+
+```sh
+#!/usr/bin/env bash
+var=${ mycmd; };
+```
+
+or
+
+```
+#!/usr/bin/env ksh
+case "$1" in
+  foo) echo "Foo!" ;;&
+  f*) echo "F-something at least" ;;
+esac
+```
+
+### Correct code:
+
+```sh
+#!/usr/bin/env ksh
+var=${ mycmd; };
+```
+
+or
+
+```
+#!/usr/bin/env bash
+case "$1" in
+  foo) echo "Foo!" ;;&
+  f*) echo "F-something at least" ;;
+esac
+```
+
+### Rationale:
+
+You are using a shell syntax feature not supported by the script's shell. Either rewrite the construct, or switch to a different shell interpreter.
+
+### Exceptions:
+
+None
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!