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manual: nix-shell: Elaborate on using -p with expressions.

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This documents the outcome of the change in
https://github.com/NixOS/nix/issues/454:

> We can also automatically add parentheses in the generated
> `buildInputs`, so you can type `nix-shell -p "expr"`
> instead of `"(expr").
This commit is contained in:
Niklas Hambüchen 2019-11-10 17:29:13 +01:00
parent 35732a95bc
commit 07294e988c
2 changed files with 27 additions and 6 deletions
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9
doc/manual/command-ref/opt-common.xml
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@ -323,7 +323,14 @@
Nix expressions to be parsed and evaluated, rather than as a list
of file names of Nix expressions.
(<command>nix-instantiate</command>, <command>nix-build</command>
and <command>nix-shell</command> only.)</para></listitem>
and <command>nix-shell</command> only.)</para>
<para>For <command>nix-shell</command>, this option is commonly used
to give you a shell in which you can build the packages returned
by the expression. If you want to get a shell which contain the
<emphasis>built</emphasis> packages ready for use, give your
expression to the <command>nix-shell -p</command> convenience flag
instead.</para></listitem>
</varlistentry>