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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pam_nologin — Prevent non-root users from login

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DESCRIPTION

pam_nologin is a PAM module that prevents users from logging into the system
when /var/run/nologin or /etc/nologin exists. The contents of the file are
displayed to the user. The pam_nologin module has no effect on the root user's
ability to log in.

OPTIONS

file=/path/nologin

    Use this file instead the default /var/run/nologin or /etc/nologin.

successok

    Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE.

EXAMPLES

The suggested usage for /etc/pam.d/login is:

auth  required  pam_nologin.so


NOTES

In order to make this module effective, all login methods should be secured by
it. It should be used as a required method listed before any sufficient methods
in order to get standard Unix nologin semantics. Note, the use of successok
module argument causes the module to return PAM_SUCCESS and as such would break
such a configuration - failing sufficient modules would lead to a successful
login because the nologin module succeeded.

AUTHOR

pam_nologin was written by Michael K. Johnson <johnsonm@redhat.com>.

haha - 2025