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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<h1 align="center">ENVSUBST</h1>

<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#AUTHOR">AUTHOR</a><br>
<a href="#REPORTING BUGS">REPORTING BUGS</a><br>
<a href="#COPYRIGHT">COPYRIGHT</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>

<hr>


<h2>NAME
<a name="NAME"></a>
</h2>


<p style="margin-left:11%; margin-top: 1em">envsubst
&minus; substitutes environment variables in shell format
strings</p>

<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>



<p style="margin-left:11%; margin-top: 1em"><b>envsubst</b>
[<i>OPTION</i>] [<i>SHELL-FORMAT</i>]</p>

<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>


<p style="margin-left:11%; margin-top: 1em">Substitutes the
values of environment variables.</p>

<p style="margin-left:11%; margin-top: 1em"><b>Operation
mode: <br>
&minus;v</b>, <b>&minus;&minus;variables</b></p>

<p style="margin-left:22%;">output the variables occurring
in SHELL-FORMAT</p>

<p style="margin-left:11%; margin-top: 1em"><b>Informative
output: <br>
&minus;h</b>, <b>&minus;&minus;help</b></p>

<p style="margin-left:22%;">display this help and exit</p>

<p style="margin-left:11%;"><b>&minus;V</b>,
<b>&minus;&minus;version</b></p>

<p style="margin-left:22%;">output version information and
exit</p>

<p style="margin-left:11%; margin-top: 1em">In normal
operation mode, standard input is copied to standard output,
with references to environment variables of the form
$VARIABLE or ${VARIABLE} being replaced with the
corresponding values. If a SHELL-FORMAT is given, only those
environment variables that are referenced in SHELL-FORMAT
are substituted; otherwise all environment variables
references occurring in standard input are substituted.</p>

<p style="margin-left:11%; margin-top: 1em">When
<b>&minus;&minus;variables</b> is used, standard input is
ignored, and the output consists of the environment
variables that are referenced in SHELL-FORMAT, one per
line.</p>

<h2>AUTHOR
<a name="AUTHOR"></a>
</h2>


<p style="margin-left:11%; margin-top: 1em">Written by
Bruno Haible.</p>

<h2>REPORTING BUGS
<a name="REPORTING BUGS"></a>
</h2>


<p style="margin-left:11%; margin-top: 1em">Report bugs to
&lt;bug-gnu-gettext@gnu.org&gt;.</p>

<h2>COPYRIGHT
<a name="COPYRIGHT"></a>
</h2>


<p style="margin-left:11%; margin-top: 1em">Copyright
&copy; 2003-2007 Free Software Foundation, Inc. License
GPLv3+: GNU GPL version 3 or later
&lt;http://gnu.org/licenses/gpl.html&gt; <br>
This is free software: you are free to change and
redistribute it. There is NO WARRANTY, to the extent
permitted by law.</p>

<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>


<p style="margin-left:11%; margin-top: 1em">The full
documentation for <b>envsubst</b> is maintained as a Texinfo
manual. If the <b>info</b> and <b>envsubst</b> programs are
properly installed at your site, the command</p>

<p style="margin-left:22%; margin-top: 1em"><b>info
envsubst</b></p>

<p style="margin-left:11%; margin-top: 1em">should give you
access to the complete manual.</p>
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