[OS X TeX] Re: Word spacing / Comparing pdfs in Acrobat
youcontrol at hispeed.ch
Thu May 4 14:01:14 EDT 2006
There used to be a nice 'How to run a Perl script on OS X for Dummies'
The website dissappeared but it still available in the Google Cache,
without pictures however. I have pasted the content of it at the bottom
of this message.
The missing picture labelled <helloWorld> said something like:
print "Hello World!\n";
(I hope all the code makes it through unchanged)
> If I click on latexdiff, it opens as a text file in BBEdit...
How do I write and run a Perl script in Mac OS X?
Perl has been called a Swiss Army Chain Saw. It's powerful, flexible
and probably runs on more operating systems than any other language.
It's the key to CGI programming for the world wide web, a sys admin's
indispensable tool and an all around great way to get some incredibly
complicated things done in only a few lines of code. Although Perl has
been ported to the Mac for some time, the unix underpinnings of Mac OS
X is taking that to a whole new level.
The steps below explain how to write a simple Hello World script using
nothing more than TextEdit and the Terminal program. Perl is already
built in to the system so there is nothing extra to buy.
1. Launch the TextEdit application that comes with Mac OS X. (You
can do this by selecting Go -> Applications in the Finder and then
double-clicking on TextEdit.)
2. Create a new document that looks like this:
3. Select Format -> Make Plain Text
4. Select File -> Save As...
5. Give the file the name helloWorld.pl and click the Save button.
Remember where you save it because you'll need to know the location
6. The system will give you a message that says that the document
named hellowWorld.pl already seems to have an extension and will ask
you if it should append .txt anyway. Click the Don't append button.
7. Launch the Terminal program. (You can do this by selecting Go ->
Applications in the Finder, then double-clicking the Utilities folder
and then double-clicking the Terminal icon.
8. Change to the directory that contains the helloWorld.pl file that
you just saved by typing: cd PATHOFFILE
For example, if the file was located in your Documents folder you
would type: cd Documents
9. Change the permissions on the file so that it can be executed by
typing: chmod 755 helloWorld.pl
755 means that the owner of the file (you) can read write and
execute it, but everyone else can only read and execute.
10. Run your script by typing: ./helloWorld.pl
11. You should now see "Hello World!"
Note: The two line program you just wrote is fairly straight forward,
but does have some things in it that may look strange. The first line
tells the computer where to find Perl to run your script. The next line
tells it to print "Hello World!" followed by a newline characater which
causes the prompt to go to the next line. The semi-colon tells Perl
that it has reached the end of the command.
Note 2: If you are going to use TextEdit for Perl very often you might
want to change a few of the preferences. You can do this by selecting
TextEdit -> Preferences... and selecting "Plain text" for New Document
Format and unchecking "Append .txt to plain text files". If you're
serious about Perl though, you may want to try using a full fledged
text editor like BBEdit. This will let you do advanced editing,
complicated Find and Replace and provides other niceties such as color
coded source code. BBedit is available in both a commercial and a free
version from Bare Bones Software.
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