diff --git a/mpw-shell-parser.cpp b/mpw-shell-parser.cpp
index 2523851..bf61e8a 100644
--- a/mpw-shell-parser.cpp
+++ b/mpw-shell-parser.cpp
@@ -13,7 +13,10 @@
 
 
 
-
+namespace ToolBox {
+	std::string MacToUnix(const std::string path);
+	std::string UnixToMac(const std::string path);
+}
 
 template<class T>
 T pop(std::vector<T> &v) {
@@ -42,7 +45,9 @@ int open(const std::string &name, int flags) {
 
 	// dup2 does not copy the O_CLOEXEC flag so it's safe to use.
 
-	int fd = ::open(name.c_str(), flags | O_CLOEXEC, 0666);
+	std::string uname = ToolBox::MacToUnix(name);
+
+	int fd = ::open(uname.c_str(), flags | O_CLOEXEC, 0666);
 	if (fd < 0) {
 		open_error(name);
 		return -1;
diff --git a/pathnames.rl b/pathnames.rl
index 8220a28..09a25ce 100644
--- a/pathnames.rl
+++ b/pathnames.rl
@@ -117,11 +117,42 @@ namespace {
 		write data;
 	}%%
 
+	%%{
+		machine dev;
+
+		main := 
+			'/dev/null'i $eof{ return "/dev/null"; }
+			|
+			'/dev/stderr'i $eof{ return "/dev/stderr"; }
+			|
+			'/dev/stdout'i $eof{ return "/dev/stdout"; }
+		;
+		write data;
+	}%%
+
 }
 
 namespace ToolBox
 {
 
+	std::string check_dev(std::string &&str) {
+
+		const char *p = str.c_str();
+		const char *pe = p + str.length();
+		const char *eof = pe;
+
+		int cs;
+		%%{
+			machine dev;
+			write init;
+			write exec;
+
+		}%%
+
+		return str;
+
+	}
+
 	std::string MacToUnix(const std::string path)
 	{
 
@@ -173,8 +204,7 @@ namespace ToolBox
 			write exec;
 		}%%
 
-
-		return rv;
+		return check_dev(std::move(rv));
 	}