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only delete things older than current gen and update logic in doc as

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This commit is contained in:
Matthew O'Gorman 2018-03-01 22:59:00 -05:00
parent 3c16044cb0
commit 467fdd8ca4
2 changed files with 14 additions and 9 deletions
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10
doc/manual/command-ref/nix-env.xml
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@ -1349,9 +1349,9 @@ 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 delete all but the number of items specified.
Periodically deleting old generations is important to make garbage
collection effective.</para>
<literal>+5</literal> to only keep the specified items older than the
current generation. Periodically deleting old generations is important
to make garbage collection effective.</para>
</refsection>
@ -1461,7 +1461,7 @@ error: no generation older than the current (91) exists</screen>
<refsection condition="manpage"><title>Environment variables</title>
<variablelist>
<varlistentry><term><envar>NIX_PROFILE</envar></term>
<listitem><para>Location of the Nix profile. Defaults to the
@ -1475,6 +1475,6 @@ error: no generation older than the current (91) exists</screen>
</variablelist>
</refsection>
</refentry>