initial import of bash 4.1

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+6.10 The Restricted Shell
+=========================
+
+If Bash is started with the name `rbash', or the `--restricted' or `-r'
+option is supplied at invocation, the shell becomes restricted.  A
+restricted shell is used to set up an environment more controlled than
+the standard shell.  A restricted shell behaves identically to `bash'
+with the exception that the following are disallowed or not performed:
+
+   * Changing directories with the `cd' builtin.
+
+   * Setting or unsetting the values of the `SHELL', `PATH', `ENV', or
+     `BASH_ENV' variables.
+
+   * Specifying command names containing slashes.
+
+   * Specifying a filename containing a slash as an argument to the `.'
+     builtin command.
+
+   * Specifying a filename containing a slash as an argument to the `-p'
+     option to the `hash' builtin command.
+
+   * Importing function definitions from the shell environment at
+     startup.
+
+   * Parsing the value of `SHELLOPTS' from the shell environment at
+     startup.
+
+   * Redirecting output using the `>', `>|', `<>', `>&', `&>', and `>>'
+     redirection operators.
+
+   * Using the `exec' builtin to replace the shell with another command.
+
+   * Adding or deleting builtin commands with the `-f' and `-d' options
+     to the `enable' builtin.
+
+   * Using the `enable' builtin command to enable disabled shell
+     builtins.
+
+   * Specifying the `-p' option to the `command' builtin.
+
+   * Turning off restricted mode with `set +r' or `set +o restricted'.
+
+These restrictions are enforced after any startup files are read.
+
+When a command that is found to be a shell script is executed (*note
+Shell Scripts::), `rbash' turns off any restrictions in the shell
+spawned to execute the script.
+