blocks|key|1690113|text|好了，我找到了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1690114|apt-cache+policy+<package+name>将显示版本详细信息。|offset|length|style|CODE|1690115|它还会显示当前安装的版本以及可以安装的版本。|1690116|例如，apt-cache+policy+hylafax%2B|1690117|entityMap^0|0|0|V|0|0|3|P|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

OK, I found it.
<code>apt-cache policy &lt;package name&gt;</code> will show the version details.
It also shows which version is currently installed and which versions are available to install.
For example, <code>apt-cache policy hylafax+</code>

blocks|key|1690179|text|下面的代码可能工作得足够好：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1690180|aptitude+versions+%5Ehylafax%2B|code-block|syntax|javascript|1690181|在aptitude(8)查看更多信息|offset|length|1690182|entityMap|0|LINK|mutability|MUTABLE|url|http://manpages.debian.org/cgi-bin/man.cgi?query=aptitude&apropos=0&sektion=0&manpath=Debian%2520testing%2520jessie&format=html&locale=en^0|0|0|1|B|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

The following might work well enough:

<pre><code>aptitude versions ^hylafax+
</code></pre>

See more in <a href="http://manpages.debian.org/cgi-bin/man.cgi?query=aptitude&amp;apropos=0&amp;sektion=0&amp;manpath=Debian%20testing%20jessie&amp;format=html&amp;locale=en" rel="noreferrer">aptitude(8)</a>

blocks|key|1903567|text|正如在其他地方发布的一样，这也是有效的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1903568|apt-cache+madison+<package_name>|offset|length|style|CODE|1903569|entityMap^0|0|0|W|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

As posted somewhere else, this works, too:

<code>apt-cache madison &lt;package_name&gt;</code>

blocks|key|1903661|text|在debian上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1903662|apt+list+--upgradable|code-block|syntax|javascript|1903663|提供包的列表、要升级的版本和包的实际版本。|1903664|结果：|1903665|base-files/stable+8%2Bdeb8u8+amd64+[upgradable+from:+8%2Bdeb8u7]
bind9-host/stable+1:9.9.5.dfsg-9%2Bdeb8u11+amd64+[upgradable+from:+1:9.9.5.dfsg-9%2Bdeb8u9]
ca-certificates/stable+20141019%2Bdeb8u3+all+[upgradable+from:+20141019%2Bdeb8u2]
certbot/jessie-backports+0.10.2-1~bpo8%2B1+all+[upgradable+from:+0.8.1-2~bpo8%2B1]
dnsutils/stable+1:9.9.5.dfsg-9%2Bdeb8u11+amd64+[upgradable+from:+1:9.9.5.dfsg-9%2Bdeb8u9]|1903666|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

on debian :

<pre><code>apt list --upgradable
</code></pre>

gives the list with package, version to be upgraded, and actual version of the package.

result : 

<pre><code>base-files/stable 8+deb8u8 amd64 [upgradable from: 8+deb8u7]
bind9-host/stable 1:9.9.5.dfsg-9+deb8u11 amd64 [upgradable from: 1:9.9.5.dfsg-9+deb8u9]
ca-certificates/stable 20141019+deb8u3 all [upgradable from: 20141019+deb8u2]
certbot/jessie-backports 0.10.2-1~bpo8+1 all [upgradable from: 0.8.1-2~bpo8+1]
dnsutils/stable 1:9.9.5.dfsg-9+deb8u11 amd64 [upgradable from: 1:9.9.5.dfsg-9+deb8u9]
</code></pre>

blocks|key|1903712|text|apt+policy+<package>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1903713|简而言之|unstyled|1903714|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>apt policy &lt;package&gt;
</code></pre>

for short

I'm thinking to install hylafax+ version 5.5.4 which was release last month on my <a href="http://en.wikipedia.org/wiki/Debian" rel="noreferrer">Debian</a> PC.
I checked <code>dpkg -l | grep &quot;hylafax&quot;</code> and found out that the current version is 5.5.3. Then I checked <code>apt-cache search hylafax</code> and saw the packages are available, but I can't see any version number.
How can I find the version of packages available in the <code>apt-get</code>?

How to check the version before installing a package using apt-get?

我正在考虑在我的 PC上安装上个月发布的hylafax+ 5.5.4版本。我查看了dpkg -l | grep "hylafax"，发现当前版本是5.5.3。然后我查看了apt-cache search hylafax，发现包是可用的，但我看不到任何版本号。如何在apt-get中找到可用的软件包版本

问如何在使用apt-get安装包之前检查版本？
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问如何在使用apt-get安装包之前检查版本？
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