Shell: Move to Userland/Shell/

Userland/Shell/Tests/sigpipe.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# `head -n 1` should close stdout of the `Shell -c` command, which means the
+# second echo should exit unsuccessfully and sigpipe.sh.out should not be
+# created.
+rm -f sigpipe.sh.out
+
+{ echo foo && echo bar && echo baz > sigpipe.sh.out } | head -n 1 > /dev/null
+
+# Failing commands don't make the test fail, just an explicit `exit 1` does.
+# So the test only fails if sigpipe.sh.out exists (since then `exit 1` runs),
+# not if the `test` statement returns false.
+test -e sigpipe.sh.out && exit 1