blocks|key|623778|text|类似于：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|623779|perl+-MModule+-e+'print+"$Module::VERSION\n"'+2>/dev/null+%7C%7C+echo+"Not+installed"|code-block|syntax|javascript|623780|会给你一个给定模块的版本，或者告诉你它没有安装。用法如下所示：|623781|perl+-MXML::Parser+-e+'print+"$XML::Parser::VERSION\n"'+2>/dev/null+%7C%7C+echo+"Not+installed"|623782|要查找模块路径，您可以检查@INC以查找可能的位置，或者您也可以查看perlwhich。还有来自pmtools的pmpath。|offset|length|style|CODE|623783|entityMap|0|LINK|mutability|MUTABLE|url|http://www.perlmonks.org/?node_id=275693|1|http://search.cpan.org/~mlfisher/pmtools/|2|http://search.cpan.org/~mlfisher/pmtools/pmpath^0|0|0|0|0|D|4|Y|9|0|1C|7|1|1K|6|2|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|16|8|@$M|17|N|18|O|P]]|9|@$M|19|N|1A|1|1B]|$M|1C|N|1D|1|1E]|$M|1F|N|1G|1|1H]]|A|$]]|$1|Q|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]|10|$5|T|U|V|A|$W|11]]]]

Something like:

<pre><code>perl -MModule -e 'print "$Module::VERSION\n"' 2&gt;/dev/null || echo "Not installed"
</code></pre>

would give you the version of a given module, or tell you it isn't installed. Usage would look like:

<pre><code>perl -MXML::Parser -e 'print "$XML::Parser::VERSION\n"' 2&gt;/dev/null || echo "Not installed"
</code></pre>

To find the module path, you could examine <code>@INC</code> to find possible locations, or you could perhaps look into <a href="http://www.perlmonks.org/?node_id=275693" rel="noreferrer">perlwhich</a>. There is also <a href="http://search.cpan.org/~mlfisher/pmtools/pmpath" rel="noreferrer">pmpath</a> from <a href="http://search.cpan.org/~mlfisher/pmtools/" rel="noreferrer">pmtools</a>.

blocks|key|623785|text|instmodsh|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|623786|NAME
+++++++instmodsh+-+A+shell+to+examine+installed+modules

SYNOPSIS
+++++++++++instmodsh

DESCRIPTION
+++++++A+little+interface+to+ExtUtils::Installed+to+examine+installed+modules,+validate+your+packlists+and+even+create+a+tarball+from+an+installed+module.

SEE+ALSO
+++++++ExtUtils::Installed|code-block|syntax|javascript|623787|entityMap^0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

<code>instmodsh</code>

<pre><code>NAME
 instmodsh - A shell to examine installed modules

SYNOPSIS
 instmodsh

DESCRIPTION
 A little interface to ExtUtils::Installed to examine installed modules, validate your packlists and even create a tarball from an installed module.

SEE ALSO
 ExtUtils::Installed
</code></pre>

blocks|key|715228|text|使用pmvers。顾名思义，它显示已安装模块的版本。如果没有安装模块，它将失败，并显示熟悉的错误消息：Can't+locate+…+in+@INC+(@INC+contains:+…)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|715229|使用同一发行版中的pmpath查找模块的安装路径。|715230|entityMap|0|LINK|mutability|MUTABLE|url|http://search.cpan.org/perldoc?pmvers|1|http://search.cpan.org/perldoc?pmpath^0|2|6|1F|15|2|6|0|0|9|6|9|6|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

Use <a href="http://search.cpan.org/perldoc?pmvers" rel="nofollow noreferrer"><code>pmvers</code></a>. Like the name suggests, it shows the version of an installed module. If a module is not installed, it fails with the familiar error message: <code>Can't locate … in @INC (@INC contains: …)</code>

Use <a href="http://search.cpan.org/perldoc?pmpath" rel="nofollow noreferrer"><code>pmpath</code></a> from the same distribution to find a module's installation path.

blocks|key|623725|text|我使用这些bash函数/+Perl单行器来查找Perl模块的版本号和位置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|623726|#+equivalent+to+perldoc+-l+<module>
perlwhere()+{
++++perl+-wle'eval+"require+$ARGV[0]"+or+die;+($mod+=+$ARGV[0])+=~+s%7C::%7C/%7Cg;+print+$INC{"${mod}.pm"}'+$1
}

perlversion()+{
++++perl+-M$1+-wle'print+$ARGV[0]->VERSION'+$1
}

:+[ether+~].2$;+perlwhere+Test::More
/usr/lib/perl5/5.8.8/Test/More.pm
:+[ether+~].2$;+perlversion+Test::More
0.94|code-block|syntax|javascript|623727|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I use these bash function/Perl oneliners to find the version number and location of Perl modules:

<pre><code># equivalent to perldoc -l &lt;module&gt;
perlwhere() {
 perl -wle'eval "require $ARGV[0]" or die; ($mod = $ARGV[0]) =~ s|::|/|g; print $INC{"${mod}.pm"}' $1
}

perlversion() {
 perl -M$1 -wle'print $ARGV[0]-&gt;VERSION' $1
}

: [ether ~].2$; perlwhere Test::More
/usr/lib/perl5/5.8.8/Test/More.pm
: [ether ~].2$; perlversion Test::More
0.94
</code></pre>

blocks|key|623746|text|pmvers实用程序和其他pmtools将执行所需的操作。否则，下面是查找模块版本的一行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|623747|perl+-le+'eval+"require+$ARGV[0]"+and+print+$ARGV[0]->VERSION'+Some::Module|code-block|syntax|javascript|623748|entityMap|0|LINK|mutability|MUTABLE|url|http://search.cpan.org/perldoc?pmvers^0|0|6|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

The <a href="http://search.cpan.org/perldoc?pmvers" rel="nofollow noreferrer">pmvers</a> utility and the other pmtools will do what you need. Otherwise here is a one-liner to find a module version:

<pre><code>perl -le 'eval "require $ARGV[0]" and print $ARGV[0]-&gt;VERSION' Some::Module
</code></pre>

blocks|key|2124165|text|据我所知，最短的事情不涉及脚本或shell别名：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2124166|$+perl+-MFoo::Bar\+99
Foo::Bar+version+99+required--this+is+only+version+1.234.|code-block|syntax|javascript|2124167|(或者，如果未安装@INC，则通常会显示不在其中的消息)|offset|length|style|CODE|2124168|对于好奇的人来说，这和perl+-e+'use+Foo::Bar+99'是一样的。|2124169|entityMap^0|0|0|9|4|0|B|P|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@$I|W|J|X|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

The shortest thing I know of that doesn't involve a script or shell alias:

<pre><code>$ perl -MFoo::Bar\ 99
Foo::Bar version 99 required--this is only version 1.234.
</code></pre>

(or the usual message about not being in <code>@INC</code> if it's not installed)

For the curious, this is the same as <code>perl -e 'use Foo::Bar 99'</code>.

blocks|key|715370|text|这是一个可以做到这一点的程序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|715371|#!/usr/bin/perl
#+testmod+-+test+to+see+if+a+module+is+available

use+strict;
use+warnings;

my+$mod+=+(shift+@ARGV)+%7C%7C+die+"usage:+$0+module\n";

#+convert+module-name+to+path
my+$file+=+$mod;
$file+=~+s{::}{/}gsmx;
$file+.=+'.pm';

#+Pull+in+the+module,+if+it+exists
eval+{+require+$file+}
++++or+die+"can't+find+module+$mod\n";

#+Get+the+version+from+the+module,+if+defined
my+$ver;
{+no+strict+'refs';
++++$ver+=+${$mod+.+"::VERSION"}+%7C%7C+'UNKNOWN';
}
#+And+its+location
my+$from+=+$INC{$file};
print+"module+$mod+is+version+$ver+loaded+from+$from\n";|code-block|syntax|javascript|715372|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's a program which does that:

<pre><code>#!/usr/bin/perl
# testmod - test to see if a module is available

use strict;
use warnings;

my $mod = (shift @ARGV) || die "usage: $0 module\n";

# convert module-name to path
my $file = $mod;
$file =~ s{::}{/}gsmx;
$file .= '.pm';

# Pull in the module, if it exists
eval { require $file }
 or die "can't find module $mod\n";

# Get the version from the module, if defined
my $ver;
{ no strict 'refs';
 $ver = ${$mod . "::VERSION"} || 'UNKNOWN';
}
# And its location
my $from = $INC{$file};
print "module $mod is version $ver loaded from $from\n";
</code></pre>

blocks|key|1924343|text|如果您正在寻找跨平台的CLI+(Linux、OSX、Windows)，请考虑我的+；例如：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1924344|#+Locate+the+Data::Dumper+module,+and+also+print
#+version+information+and+core-module+status.
$+whichpm+-v+Data::Dumper
Data::Dumper++++2.145+++core>=5.005+/usr/lib/perl/5.18/Data/Dumper.pm|code-block|syntax|javascript|1924345|它还可以查找意外的重复项并列出所有已安装的模块。|1924346|如果您碰巧安装了Node.js+/+io.js，您可以从npm注册表安装它：|1924347|[sudo]+npm+install+whichpm+-g|1924348|有关手动安装说明和更多信息，请参阅the+repo；这里有指向latest+version的直接下载链接(将保持最新状态)。|1924349|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/mklement0/whichpm|1|2|https://raw.githubusercontent.com/mklement0/whichpm/stable/bin/whichpm^0|7|7|14|1|0|0|0|0|0|0|H|8|1|V|E|2|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|H|7|19|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1A|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|1B|8|@]|D|@]|E|$]]|$1|O|3|P|5|H|7|1C|8|@]|D|@]|E|$I|J]]|$1|Q|3|R|5|6|7|1D|8|@]|D|@$9|1E|A|1F|1|1G]|$9|1H|A|1I|1|1J]]|E|$]]|$1|S|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|Z]]|11|$5|V|W|X|E|$Y|12]]]]

If you're looking for a cross-platform CLI (Linux, OSX, Windows), consider my <a href="https://github.com/mklement0/whichpm" rel="nofollow"><code>whichpm</code> utility</a>; e.g.:

<pre><code># Locate the Data::Dumper module, and also print
# version information and core-module status.
$ whichpm -v Data::Dumper
Data::Dumper 2.145 core&gt;=5.005 /usr/lib/perl/5.18/Data/Dumper.pm
</code></pre>

It can also find accidental duplicates and list all installed modules.

If you happen to have Node.js / io.js installed, you can install it from the npm registry:

<pre><code>[sudo] npm install whichpm -g
</code></pre>

For manual installation instructions and more, see <a href="https://github.com/mklement0/whichpm" rel="nofollow">the repo</a>; here's a direct download link to the <a href="https://raw.githubusercontent.com/mklement0/whichpm/stable/bin/whichpm" rel="nofollow">latest version</a> (will stay current).

Is there a smart way to detect whether a certain Perl module has been installed in your system?
My old sutpid way is to write a Perl script in which the only thing I do is just to use the module. If nothing croaks when I run the detect script, then I know the module has been installed, although I still don't know which version and where the module has been installed .

thanks in advance.

How can I get the version and location of an installed Perl module?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有没有一种聪明的方法来检测系统中是否安装了某个Perl模块？我的老方法是编写一个Perl脚本，在这个脚本中，我唯一要做的就是使用模块。如果在运行检测脚本时没有发出任何声音，那么我知道模块已经安装，尽管我仍然不知道模块安装的版本和位置。提前谢谢。

问如何获得已安装的Perl模块的版本和位置？
EN

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问如何获得已安装的Perl模块的版本和位置？EN