Re: how to execute a perl file in cgi?

[Bill Jones]

--- Xiangli Zhang <[EMAIL PROTECTED]> wrote:

> Since I want to analyse a complicated problem involved with one
> file.pl, I am suspect the .pl file was not executed. I tried with
> very simple file.pl only printing one line, but it does not work. The
> following is the code:
>  
> the cgi file
>  
>  
> #!/usr/bin/perl
> use lib '/srv/www/cgi-bin/phrap';
> 
> print "Content-type: text/html\n\n";
> print "Perl CGI Example # 2";
> print "";
> print "Alignment Result ";
> print "";
> 
> system("perl", "/srv/www/cgi-bin/phrap/testL.pl");
> print "";
> print "";
> print "";
> 
> the .pl file testL.pl
>  
> #!/usr/bin/perl
> print "%%\n\n";
> 


A series of Percent signs is significant to the resulting web browser;
please try to use a sim ple, plain old, ASCII text - maybe just "Hi, I
am the testL programs output" ???

>  
> testL.pl is in the folder '/srv/www/cgi-bin/phrap', both of the files
> have maximum permissions
>  
> I am suspecting the problem is related to configuration of Apache web
> server. Is it possible? Since, the exact files work fine in one
> server, but not in the other. 
>  
> I am not so familiar with Apache configuration, just know some basic
> things.
>  
> Any suggestions?


How do you know that the use lib is working?  Can you prove the
programs both work for the command line first - before you try them as
CGIs?

As far as apache is concerned I suggest:

http://httpd.apache.org/docs-2.0/howto/cgi.html

:)
-Sx-



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Re: how to execute a perl file in cgi?

[Bill Jones]

--- Gunnar Hjalmarsson <[EMAIL PROTECTED]> wrote:

> Bill Jones wrote:
> > The third way - `` (back-ticks) is highly discouraged.
> 
> Discouraged? Why? I thought that was depending on what exactly it is
> you want to do, e.g. whether you want to capture the output from the
> script you run.


Well, it is definitely a matter of taste, true.  There are cleaner ways
to "capture" the external program's output.

Personally I have seen, in my short time programming in Perl, that some
versions of Perl have at times executed `` (back-ticks) as if they were
contained inside a BEGIN block -- that is prior to executing my code in
correct sequence.

Don't misundertsnad me, I have used back-ticks a lot.  I just feel
there are better (read: clearer) ways to start an external program from
Perl.

:)
-Sx-


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Re: how to execute a perl file in cgi?

[Bill Jones]

--- Xiangli Zhang <[EMAIL PROTECTED]> wrote:

> Can anybody tell me how to execute a perl file in perl cgi? E.g
> "test.cgi " and "file.pl", I want to add one line to execute file.pl
> in test.cgi. How I can do it?

There are two paths you can choose for execution:

system - which executes and then returns control.
exec - which executes and doesnt return control.

The third way - `` (back-ticks) is highly discouraged.

Cheers;
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how to execute a perl file in cgi?

[Xiangli Zhang]

Can anybody tell me how to execute a perl file in perl cgi? E.g "test.cgi " and 
"file.pl", I want to add one line to execute file.pl in test.cgi. How I can do it?
 
Justin


Xiangli Zhang (Justin)
306-310 Decaire Street, Coquitlam
BC, Canada, V3K 6X1
phone: 604-9399181

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