From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Gary
Yang
Sent: 24 January 2008 19:17
To: [email protected]
Subject: Questions on porting Perl from Windows to Unix
> Hi All,
>
> I need to port my Perl script from Unix to Windows. Can someone tell
me how to figure out which platform I am
> on? i.e. I need to know which Perl command can help me determin the
platform. Once I know the platform, I'll
> code my script as the example bellow. But, how to figure out I am on
Windows or Unix?
>
> if ($usingUNIX)
> {
> $directory = `ls`; #UNIX version.
> $copyCommand = `cp`; #UNIX version.
> }
> else
> {
> $directory = `dir`; #Win32 version.
> $copyCommand = `COPY`; #Win32 version.
> }
First, it is probably better if you write your scripts so that you don't
need to ask, i.e. aim for platform independence. Where this is not
possible there is the special variable $^O (See 'perldoc perlvar' for
details). If you need more detailed info about your platform you will
need the Config module (See 'perldoc Config'). Also see the Activestate
documentation for windows specific help.
>
>
> Second question:
> The UNIX #!/usr/bin/perl notation does not work with Perl scripts on
Windows. How should I code if it is Unix I > place "#!/usr/bin/perl" at
the very first line of the script? But, I do not place it at the first
line of code > if it is not Unix? How should I do it?
The #! notation us unix specific. Win32 achieves a similar effect by
associating file extensions with a specific executable, called file
association and managed with the assoc command, but I think that the
Activestate installation procedure sets up the necessary associations
for Perl, so you shouldn't need to. If you use the #! line for to
specify run time switches you can still do that as perl will parse that
as well (see 'perldoc perlrun').
HTH
--
Brian Raven
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