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docs: describe $IN_NIX_SHELL values (#2796) 

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Vladimír Čunát 2019-05-17 09:50:42 +02:00 committed by GitHub
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doc/manual/command-ref/env-common.xml
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@ -14,7 +14,8 @@
<varlistentry><term><envar>IN_NIX_SHELL</envar></term>
<listitem><para>Indicator that tells if the current environment was set up by
<command>nix-shell</command>.</para></listitem>
<command>nix-shell</command>. Since Nix 2.0 the values are
<literal>"pure"</literal> and <literal>"impure"</literal></para></listitem>
</varlistentry>