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* Document `nix-env --compare-versions'.

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Eelco Dolstra 2005-10-06 15:51:43 +00:00
parent cec2be64f3
commit 62412c5874
1 changed files with 69 additions and 10 deletions
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doc/manual/nix-env.xml
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@ -534,10 +534,14 @@ $ nix-env -e '*' <lineannotation>(remove everything)</lineannotation></screen>
<arg choice='plain'><option>-a</option></arg>
</group>
<group choice='req'>
<arg choice='plain'><option>--name</option></arg>
<arg choice='plain'><option>--expr</option></arg>
<arg choice='plain'><option>--status</option></arg>
<arg choice='plain'><option>-s</option></arg>
<arg choice='plain'><option>--no-name</option></arg>
<arg choice='plain'><option>--compare-versions</option></arg>
<arg choice='plain'><option>-c</option></arg>
<arg choice='plain'><option>--system</option></arg>
<arg choice='plain'><option>--drv-path</option></arg>
<arg choice='plain'><option>--out-path</option></arg>
</group>
</cmdsynopsis>
@ -625,6 +629,51 @@ user environment elements, etc. -->
</varlistentry>
<varlistentry><term><option>--compare-versions</option> /
<option>-c</option></term>
<listitem><para>Compare installed versions to available versions,
or vice versa (if <option>--available</option> is given). This is
useful for quickly seeing whether upgrades for installed
components are available in a Nix expression. A column is added
with the following meaning:
<variablelist>
<varlistentry><term><literal>&lt;</literal> <replaceable>version</replaceable></term>
<listitem><para>A newer version of the component is available
or installed.</para></listitem>
</varlistentry>
<varlistentry><term><literal>=</literal> <replaceable>version</replaceable></term>
<listitem><para>At most the same version of the component is
available or installed.</para></listitem>
</varlistentry>
<varlistentry><term><literal>></literal> <replaceable>version</replaceable></term>
<listitem><para>Only older versions of the component are
available or installed.</para></listitem>
</varlistentry>
<varlistentry><term><literal>- ?</literal></term>
<listitem><para>No version of the component is available or
installed.</para></listitem>
</varlistentry>
</variablelist>
</para></listitem>
</varlistentry>
<varlistentry><term><option>--system</option></term>
<listitem><para>Print the <literal>system</literal> attribute of
@ -655,27 +704,37 @@ user environment elements, etc. -->
<screen>
$ nix-env -q <lineannotation>(show installed derivations)</lineannotation>
MozillaFirebird-0.7
bison-1.875c
docbook-xml-4.2
firefox-1.0.4
MPlayer-1.0pre7
ORBit2-2.8.3
...
$ nix-env -qa <lineannotation>(show available derivations)</lineannotation>
firefox-1.0.7
GConf-2.4.0.1
MPlayer-1.0pre3
MozillaFirebird-0.7
MPlayer-1.0pre7
ORBit2-2.8.3
...
$ nix-env -qas <lineannotation>(show status of available derivations)</lineannotation>
-P- GConf-2.4.0.1 <lineannotation>(not installed but present)</lineannotation>
--S MPlayer-1.0pre3 <lineannotation>(not present, but there is a substitute for fast installation)</lineannotation>
--S MozillaFirebird-0.7 <lineannotation>(i.e., this is not the installed Firebird, even though the version is the same!)</lineannotation>
IP- bison-1.875c <lineannotation>(installed and by definition present)</lineannotation>
-P- firefox-1.0.7 <lineannotation>(not installed but present)</lineannotation>
--S GConf-2.4.0.1 <lineannotation>(not present, but there is a substitute for fast installation)</lineannotation>
--S MPlayer-1.0pre3 <lineannotation>(i.e., this is not the installed MPlayer, even though the version is the same!)</lineannotation>
IP- ORBit2-2.8.3 <lineannotation>(installed and by definition present)</lineannotation>
...
$ nix-env -f ./foo.nix -qa <lineannotation>(show available derivations in the Nix expression <filename>foo.nix</filename>)</lineannotation>
foo-1.2.3</screen>
foo-1.2.3
$ nix-env -qc <lineannotation>(compare installed versions to what’s available)</lineannotation>
<replaceable>...</replaceable>
acrobat-reader-7.0 - ? <lineannotation>(package is not available at all)</lineannotation>
autoconf-2.59 = 2.59 <lineannotation>(same version)</lineannotation>
firefox-1.0.4 &lt; 1.0.7 <lineannotation>(a more recent version is available)</lineannotation>
<replaceable>...</replaceable>
</screen>
</refsection>