Index: node_modules/rw/lib/rw/dash.js
===================================================================
--- node_modules/rw/lib/rw/dash.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/rw/lib/rw/dash.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,14 @@
+var slice = Array.prototype.slice;
+
+function dashify(method, file) {
+  return function(path) {
+    var argv = arguments;
+    if (path == "-") (argv = slice.call(argv)).splice(0, 1, file);
+    return method.apply(null, argv);
+  };
+}
+
+exports.readFile = dashify(require("./read-file"), "/dev/stdin");
+exports.readFileSync = dashify(require("./read-file-sync"), "/dev/stdin");
+exports.writeFile = dashify(require("./write-file"), "/dev/stdout");
+exports.writeFileSync = dashify(require("./write-file-sync"), "/dev/stdout");
Index: node_modules/rw/lib/rw/decode.js
===================================================================
--- node_modules/rw/lib/rw/decode.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/rw/lib/rw/decode.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,23 @@
+module.exports = function(options) {
+  if (options) {
+    if (typeof options === "string") return encoding(options);
+    if (options.encoding !== null) return encoding(options.encoding);
+  }
+  return identity();
+};
+
+function identity() {
+  var chunks = [];
+  return {
+    push: function(chunk) { chunks.push(chunk); },
+    value: function() { return Buffer.concat(chunks); }
+  };
+}
+
+function encoding(encoding) {
+  var chunks = [];
+  return {
+    push: function(chunk) { chunks.push(chunk); },
+    value: function() { return Buffer.concat(chunks).toString(encoding); }
+  };
+}
Index: node_modules/rw/lib/rw/encode.js
===================================================================
--- node_modules/rw/lib/rw/encode.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/rw/lib/rw/encode.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,7 @@
+module.exports = function(data, options) {
+  return typeof data === "string"
+      ? new Buffer(data, typeof options === "string" ? options
+          : options && options.encoding !== null ? options.encoding
+          : "utf8")
+      : data;
+};
Index: node_modules/rw/lib/rw/read-file-sync.js
===================================================================
--- node_modules/rw/lib/rw/read-file-sync.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/rw/lib/rw/read-file-sync.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,29 @@
+var fs = require("fs"),
+    decode = require("./decode");
+
+module.exports = function(filename, options) {
+  if (fs.statSync(filename).isFile()) {
+    return fs.readFileSync(filename, options);
+  } else {
+    var fd = fs.openSync(filename, options && options.flag || "r"),
+        decoder = decode(options);
+
+    while (true) { // eslint-disable-line no-constant-condition
+      try {
+        var buffer = new Buffer(bufferSize),
+            bytesRead = fs.readSync(fd, buffer, 0, bufferSize);
+      } catch (e) {
+        if (e.code === "EOF") break;
+        fs.closeSync(fd);
+        throw e;
+      }
+      if (bytesRead === 0) break;
+      decoder.push(buffer.slice(0, bytesRead));
+    }
+
+    fs.closeSync(fd);
+    return decoder.value();
+  }
+};
+
+var bufferSize = 1 << 16;
Index: node_modules/rw/lib/rw/read-file.js
===================================================================
--- node_modules/rw/lib/rw/read-file.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/rw/lib/rw/read-file.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,23 @@
+var fs = require("fs"),
+    decode = require("./decode");
+
+module.exports = function(path, options, callback) {
+  if (arguments.length < 3) callback = options, options = null;
+
+  switch (path) {
+    case "/dev/stdin": return readStream(process.stdin, options, callback);
+  }
+
+  fs.stat(path, function(error, stat) {
+    if (error) return callback(error);
+    if (stat.isFile()) return fs.readFile(path, options, callback);
+    readStream(fs.createReadStream(path, options ? {flags: options.flag || "r"} : {}), options, callback); // N.B. flag / flags
+  });
+};
+
+function readStream(stream, options, callback) {
+  var decoder = decode(options);
+  stream.on("error", callback);
+  stream.on("data", function(d) { decoder.push(d); });
+  stream.on("end", function() { callback(null, decoder.value()); });
+}
Index: node_modules/rw/lib/rw/write-file-sync.js
===================================================================
--- node_modules/rw/lib/rw/write-file-sync.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/rw/lib/rw/write-file-sync.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,32 @@
+var fs = require("fs"),
+    encode = require("./encode");
+
+module.exports = function(filename, data, options) {
+  var stat;
+
+  try {
+    stat = fs.statSync(filename);
+  } catch (error) {
+    if (error.code !== "ENOENT") throw error;
+  }
+
+  if (!stat || stat.isFile()) {
+    fs.writeFileSync(filename, data, options);
+  } else {
+    var fd = fs.openSync(filename, options && options.flag || "w"),
+        bytesWritten = 0,
+        bytesTotal = (data = encode(data, options)).length;
+
+    while (bytesWritten < bytesTotal) {
+      try {
+        bytesWritten += fs.writeSync(fd, data, bytesWritten, bytesTotal - bytesWritten, null);
+      } catch (error) {
+        if (error.code === "EPIPE") break; // ignore broken pipe, e.g., | head
+        fs.closeSync(fd);
+        throw error;
+      }
+    }
+
+    fs.closeSync(fd);
+  }
+};
Index: node_modules/rw/lib/rw/write-file.js
===================================================================
--- node_modules/rw/lib/rw/write-file.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/rw/lib/rw/write-file.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,22 @@
+var fs = require("fs"),
+    encode = require("./encode");
+
+module.exports = function(path, data, options, callback) {
+  if (arguments.length < 4) callback = options, options = null;
+
+  switch (path) {
+    case "/dev/stdout": return writeStream(process.stdout, "write", data, options, callback);
+    case "/dev/stderr": return writeStream(process.stderr, "write", data, options, callback);
+  }
+
+  fs.stat(path, function(error, stat) {
+    if (error && error.code !== "ENOENT") return callback(error);
+    if (stat && stat.isFile()) return fs.writeFile(path, data, options, callback);
+    writeStream(fs.createWriteStream(path, options ? {flags: options.flag || "w"} : {}), "end", data, options, callback); // N.B. flag / flags
+  });
+};
+
+function writeStream(stream, send, data, options, callback) {
+  stream.on("error", function(error) { callback(error.code === "EPIPE" ? null : error); }); // ignore broken pipe, e.g., | head
+  stream[send](encode(data, options), function(error) { callback(error && error.code === "EPIPE" ? null : error); });
+}