- Added Process.getPid() and Terminal.isTerminal().

- Added a test command-line app.

src/main/java/net/rubygrapefruit/platform/PosixFile.java

@@ -0,0 +1,12 @@
+package net.rubygrapefruit.platform;
+
+import java.io.File;
+
+/**
+ * Functions to query and modify a file's POSIX meta-data.
+ */
+public interface PosixFile extends NativeIntegration {
+    void setMode(File path, int perms) throws NativeException;
+
+    int getMode(File path) throws NativeException;
+}