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diff --git a/third_party/nix/tests/misc.sh b/third_party/nix/tests/misc.sh
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+source common.sh
+
+# Tests miscellaneous commands.
+
+# Do all commands have help?
+#nix-env --help | grep -q install
+#nix-store --help | grep -q realise
+#nix-instantiate --help | grep -q eval
+#nix-hash --help | grep -q base32
+
+# Can we ask for the version number?
+nix-env --version | grep "$version"
+
+# Usage errors.
+nix-env --foo 2>&1 | grep "no operation"
+nix-env -q --foo 2>&1 | grep "unknown flag"
+
+# Eval Errors.
+nix-instantiate --eval -E 'let a = {} // a; in a.foo' 2>&1 | grep "infinite recursion encountered, at .*(string).*:1:15$"