晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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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.

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