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Reword to clarify newer generations are left alone

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My attempt at clarifying the docs resulted in a false explanation. This
is now fixed and I added an example to eliminate all possible confusion.
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toonn 2019-08-29 13:46:38 +02:00
parent 1dbaf11948
commit 5bdac86be2
1 changed files with 4 additions and 1 deletions
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5
doc/manual/command-ref/nix-env.xml
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@ -1371,7 +1371,10 @@ special value <literal>old</literal> to delete all non-current
generations, a value such as <literal>30d</literal> to delete all
generations older than the specified number of days (except for the
generation that was active at that point in time), or a value such as
<literal>+5</literal> to only keep the specified number of generations.
<literal>+5</literal> to keep the last <literal>5</literal> generations
ignoring any newer than current, e.g., if <literal>30</literal> is the current
generation <literal>+5</literal> will delete generation <literal>25</literal>
and all older generations.
Periodically deleting old generations is important to make garbage collection
effective.</para>