An alternative method to using `upgrade` from the default CPAN shell is to use [`cpanminus`][cpanm] and [`cpan-outdated`][cpan-outdated].

These are so easy and nimble to use that I hardly ever go back to CPAN shell. To upgrade all of your modules in one go, the command is:

    cpan-outdated -p | cpanm

I recommend you install `cpanminus` like the docs describe:

    curl -L https://cpanmin.us | perl - App::cpanminus

And then install `cpan-outdated` along with all other CPAN modules using `cpanm`:

    cpanm App::cpanoutdated

BTW: If you are using `perlbrew` then you will need to repeat this for every Perl you have installed under it.

You can find out more about `cpanminus` and `cpan-outdated` at the Github repos here:

* https://github.com/miyagawa/cpanminus
* https://github.com/tokuhirom/cpan-outdated

[cpanm]:https://search.cpan.org/dist/App-cpanminus/lib/App/cpanminus.pm
[cpan-outdated]:https://search.cpan.org/dist/App-cpanoutdated/bin/cpan-outdated

An easy way to upgrade all Perl packages (CPAN modules) is the following way:

    cpan upgrade /(.*)/

cpan will recognize the regular expression like this and will update/upgrade all packages installed.



For Strawberry Perl, try:

    cpan -u


Try `perl -MCPAN -e &quot;upgrade /(.\*)/&quot;`. It works fine for me.

[`upgrade`](http://p3rl.org/CPAN#upgrade-Module-Regexp-...)

BTW there is a `help` command.

We currently have a crude mechanism to convert numbers to words (e.g. using a few static arrays) and based on the size of the number translating that into an english text. But we are running into issues for numbers which are huge.

    10183 = Ten thousand one hundred eighty three
    90 = Ninety
    5888 = Five thousand eight hundred eighty eight

Is there an easy to use function in any of the math libraries which I can use for this purpose?

How to convert number to words in java

I have three tables named

    **Student Table**
    -------------
    id    name
    -------------
    1     ali
    2     ahmed
    3     john
    4     king

    **Course Table**
    -------------
    id    name
    -------------
    1     physic
    2     maths
    3     computer
    4     chemistry

    **Bridge**
    -------------
    sid    cid
    -------------
    1     1
    1     2
    1     3
    1     4
    2     1
    2     2
    3     3
    3     4
    4     1
    4     2

Now to show the student name with the course name which he had studied like,

    **Result**
    ---------------------------
    Student        Course
    ---------------------------
    ahmed         physic
    ahmed         maths
    ahmed         computer
    ahmed         chemistry
    ali           physic
    ali           maths
    john          computer
    john          chemistry
    king          physic
    king          maths

I build following query

    select s.name as Student, c.name as Course from student s, course c join bridge b on c.id = b.cid order by s.name

But it does not return the required result...

And what would be for normalized form, if I want to find who is manager over other:

    **employee**
    -------------------
    id        name
    -------------------
    1         ali
    2         king
    3         mak
    4         sam
    5         jon

    **manage**
    --------------
    mid      eid
    --------------
    1         2
    1         3
    3         4
    4         5

And wants to get this result:

    **result**
    --------------------
    Manager      Staff
    --------------------
    ali          king
    ali          mak
    mak          sam
    sam          jon


Joining three tables using MySQL

How do I update all my CPAN modules to their latest versions?

<p>How do I update all my CPAN modules to their latest versions?</p>


&gt; **Possible Duplicate:**  
&gt; [What are the common workarounds for multi-line comments in Perl?](https://stackoverflow.com/questions/3608957)  

&lt;!-- End of automatically inserted text --&gt;

How do I add a multi-line comment to Perl source code?


How do I enter a multi-line comment in Perl?

I&#39;m not sure if these paths are duplicates. Given the relative path, how do I determine absolute path using a shell script?

Example:

    relative path: /x/y/../../a/b/z/../c/d

    absolute path: /a/b/c/d

Converting relative path into absolute path?

At work it seems like no week ever passes without some encoding-related conniption, calamity, or catastrophe.  The problem usually derives from programmers who think they can reliably process a “text” file without specifying the encoding.  But you can&#39;t.

So it&#39;s been decided to henceforth forbid files from ever having names that end in `*.txt` or `*.text`.  The thinking is that those extensions mislead the casual programmer into a dull complacency regarding encodings, and this leads to improper handling.  It would almost be better to have no
extension at all, because at least then you *know* that you don’t know what you’ve got.

However, we aren’t goint to go that far.  Instead you will be expected to use a filename that ends in the encoding.  So for text files, for example, these would be something like `README.ascii`, `README.latin1`, `README.utf8`, etc.

For files that demand a particular extension, if one can specify the encoding inside the file itself, such as in Perl or Python, then you shall do that.  For files like Java source where no such facility exists internal to the file, you will put the encoding before the extension, such as `SomeClass-utf8.java`.

For output, UTF-8 is to be **strongly** preferred.

But for input, we need to figure out how to deal with the thousands of files in our codebase named `*.txt`.  We want to rename all of them to fit into our new standard.  But we can’t possibly eyeball them all.  So we need a library or program that actually works.

These are variously in ASCII, ISO-8859-1, UTF-8, Microsoft CP1252, or Apple MacRoman.  Although we&#39;re know we can tell if something is ASCII, and we stand a good change of knowing if something is probably UTF-8, we’re stumped about the 8-bit encodings.  Because we’re running in a mixed Unix environment (Solaris, Linux, Darwin) with most desktops being Macs, we have quite a few annoying MacRoman files.  And these especially are a problem.

For some time now I’ve been looking for a way to programmatically determine which of

1. ASCII
2. ISO-8859-1
3. CP1252
4. MacRoman
5. UTF-8

a file is in, and I haven’t found a program or library that can reliably distinguish between those the three different 8-bit encodings.  We probably have over a thousand MacRoman files alone, so whatever charset detector we use has to be able to sniff those out.  Nothing I’ve looked at can manage the trick.  I had big hopes for the [ICU charset detector library](http://userguide.icu-project.org/conversion/detection#TOC-CharsetDetector), but it cannot handle MacRoman.  I’ve also looked at modules to do the same sort of thing in both Perl and Python, but again and again it’s always the same story: no support for detecting MacRoman.

What I am therefore looking for is an existing library or program that reliably determines which of those five encodings a file is in—and preferably more than that.  In particular it has to distinguish between the three 3-bit encoding I’ve cited, **especially MacRoman**.  The files are more than 99% English language text; there are a few in other languages, but not many.

If it’s library code, our language preference is for it to be in Perl, C, Java, or Python, and in that order.  If it’s just a program, then we don’t really care what language it’s in so long as it comes in full source, runs on Unix, and is fully unencumbered.

Has anyone else had this problem of a zillion legacy text files randomly encoded?  If so, how did you attempt to solve it, and how successful were you?  This is the most important aspect of my question, but I’m also interested in whether you think encouraging programmers to name (or rename) their files with the actual encoding those files are in will help us avoid the problem in the future.   Has anyone ever tried to enforce this on an institutional basis, and if so, was *that* successful or not, and why?

And yes, I fully understand why one cannot guarantee a definite answer given the nature of the problem.   This is especially the case with small files, where you don’t have enough data to go on. Fortunately, our files are seldom small. Apart from the random `README` file, most are in the size range of 50k to 250k, and many are larger.  Anything more than a few K in size is guaranteed to be in English.

 The problem domain is biomedical text mining, so we sometimes deal with extensive and extremely large corpora, like all of PubMedCentral’s Open Access respository.   A rather huge file is the BioThesaurus 6.0, at 5.7 gigabytes. This file is especially annoying because it is *almost* all UTF-8.  However, some numbskull went and stuck a few lines in it that are in some 8-bit encoding—Microsoft CP1252, I believe.  It takes quite a while before you trip on that one. :(

How to reliably guess the encoding between MacRoman, CP1252, Latin1, UTF-8, and ASCII

To see if a file exists before using it, we can use:

    if (-e &quot;filename.cgi&quot;)
    {
     #proceed with your code
    } 

But how to indentify a directory exists or not?

How to see if a directory exists or not in Perl?

I have a simple Perl script to read a file line by line. Code is below. I want to display two lines and break the loop. But it doesn&#39;t work. Where is the bug?


    $file=&#39;SnPmaster.txt&#39;;
    open(INFO, $file) or die(&quot;Could not open  file.&quot;);
    
    $count = 0;	
    foreach $line (&lt;INFO&gt;)	{	
    	print $line;	
    	if ($++counter == 2){
    	  last;
    	}
    }
    close(INFO);

Perl read line by line

There are multiple installers for cpan modules available; I know of at least CPAN.pm (comes with perl,) CPANPLUS, and cpanminus.

What is the difference between the three?

What situations call for using one over the other?

Are there other module installers I should know about?

Which cpan installer is the right one? (CPAN.pm/CPANPLUS/cpanminus)

Until now I used [ActiveState][1]&#39;s [ActivePerl][2], and used the ppm for installing modules.

Last week I moved to [Strawberry Perl][3], but I don&#39;t know how I should install modules using Strawberry Perl. What is some information on how module installation is done using Strawberry Perl or is there some link on how to install new modules?

  [1]: https://en.wikipedia.org/wiki/ActiveState
  [2]: https://en.wikipedia.org/wiki/ActivePerl
  [3]: https://en.wikipedia.org/wiki/Strawberry_Perl


Content Type	Original Author	Original Content on Stackoverflow
Question	David B	View Question on Stackoverflow
Solution 1 - Perl	draegtun	View Answer on Stackoverflow
Solution 2 - Perl	Michael Armbruster	View Answer on Stackoverflow
Solution 3 - Perl	Denis Howe	View Answer on Stackoverflow
Solution 4 - Perl	Matthias Munz	View Answer on Stackoverflow
Solution 5 - Perl	musiKk	View Answer on Stackoverflow

How do I update all my CPAN modules to their latest versions?

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Joining three tables using MySQL

How to convert number to words in java

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