testing version of LuaBIOS and OpenOS

people were having issues getting them to work so now we promote consistency

data/OpenOS/bin/cd.lua

@@ -0,0 +1,51 @@
+local shell = require("shell")
+local fs = require("filesystem")
+
+local args, ops = shell.parse(...)
+local path = nil
+local verbose = false
+
+if ops.help then
+  print(
+[[Usage cd [dir]
+For more options, run: man cd]])
+  return
+end
+
+if #args == 0 then
+  local home = os.getenv("HOME")
+  if not home then
+    io.stderr:write("cd: HOME not set\n")
+    return 1
+  end
+  path = home
+elseif args[1] == '-' then
+  verbose = true
+  local oldpwd = os.getenv("OLDPWD");
+  if not oldpwd then
+    io.stderr:write("cd: OLDPWD not set\n")
+    return 1
+  end
+  path = oldpwd
+else
+  path = args[1]
+end
+
+local resolved = shell.resolve(path)
+if not fs.exists(resolved) then
+  io.stderr:write("cd: ",path,": No such file or directory\n")
+  return 1
+end
+
+path = resolved
+local oldpwd = shell.getWorkingDirectory()
+local result, reason = shell.setWorkingDirectory(path)
+if not result then
+  io.stderr:write("cd: ", path, ": ", reason)
+  return 1
+else
+  os.setenv("OLDPWD", oldpwd)
+end
+if verbose then
+  os.execute("pwd")
+end