Added access to environment variables, and new test script listallexecutablesinpath.

SwiftShell/File.swift

@@ -73,6 +73,7 @@ public func open(path: String, mode: FileMode = .Read) -> File {
 	return file!
 }
 
+public let environment = NSProcessInfo.processInfo().environment as [String: String]
 public let standardinput = File.fileHandleWithStandardInput()
 public let standardoutput = File.fileHandleWithStandardOutput()
 public let standarderror = File.fileHandleWithStandardError()

SwiftShellTests/Scripts/listallexecutablesinpath.swift

@@ -0,0 +1,8 @@
+
+import SwiftShell
+
+let directories = environment["PATH"]!.split(":")
+
+for directory in directories {
+	run("find \(directory) -type f -perm +ugo+x -print") |> standardoutput
+}