In PERL Syntax

8/9/2019 In PERL Syntax

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__END__ in PERL syntaxIt seems __END__ is a "synonym" of __DATA__ following code proves that

Perl Syntax (Toggle Plain Text)

1.while () {

2.print;

3.}

4.

5.__END__

6.hello

7.

8.__DATA__

9.first data line

10.2nd data line

while () { print; } __END__ hello __DATA__ first data line 2nd data line

Perl Syntax (Toggle Plain Text)

1.C:\>perl c:\d.pl

2.hello

3.

4.first data line

5.2nd data line


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C:\>perl c:\d.pl hello first data line 2nd data line

the text "hello" is displayed as it was put in __DATA__ section.lordspaceReputation Points: 12

Solved Threads: 5Junior Poster in Traininglordspace is offline Offline68 postssince May 2006Permalink Mar 27th, 20070Re: __END__ in PERL syntaxClick to Expand / Collapse Quote originally posted by lordspace ...

It seems __END__ is a "synonym" of __DATA__

http://perldoc.perl.org/perldata.html

Quote ...

For compatibility with older scripts written before __DATA__ was introduced,

__END__ behaves like __DATA__ in the toplevel script (but not in files loaded withrequire or do) and leaves the remaining contents of the file accessible via main::DATA .

Last edited by KevinADC; Mar 27th, 2007 at 12:37 am.KevinADCReputation Points: 176Solved Threads: 67Practically a Posting Shark KevinADC is offline Offline898 postssince Mar 2006Permalink 16 Days Ago0Re: __END__ in PERL syntaxI guess its something to do with the POD (Plain Old Documentation)..

You can refer to http://perldoc.perl.org/perlpod.html


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You can put the documentation at the end of the file. So wen u use man or help inoptions on command line this documentation could be fetched and displayed.abhijithtk Reputation Points: 10

Solved Threads: 0 Newbie Poster abhijithtk is offline Offline3 postssince Jun 2010Permalink 16 Days Ago1Re: __END__ in PERL syntaxClick to Expand / Collapse Quote originally posted by abhijithtk ...

I guess its something to do with the POD (Plain Old Documentation)..

You can refer to http://perldoc.perl.org/perlpod.html

You can put the documentation at the end of the file. So wen u use man or help inoptions on command line this documentation could be fetched and displayed.

Er, no. _END_ (and the moderner _DATA_) are markers for the script to ignore/not

parse what follows, but makes it available from the "built-in" file handle DATA. PODuses a different set of markers to allow documentation to be included in the script andignored as code. Some folks may *use* _END_ to hide their comments/PDD from thecode but that's not it's purpose.afbachReputation Points: 11Solved Threads: 0

Newbie Poster afbach is offline Offline7 postssince Mar 2006Permalink 16 Days Ago0Re: __END__ in PERL syntaxClick to Expand / Collapse Quote originally posted by afbach ...

Er, no. _END_ (and the moderner _DATA_) are markers for the script to ignore/not


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parse what follows, but makes it available from the "built-in" file handle DATA. PODuses a different set of markers to allow documentation to be included in the script andignored as code. Some folks may *use* _END_ to hide their comments/PDD from thecode but that's not it's purpose.

Ok Question..

http://perldoc.perl.org/Pod/Usage.html

Have a look under "Recommended Usage" at the bottom of the page. I copied the scriptand tried to run it on my machine. For some reason it doesnt display anything if i givethe -man or -help options.

Any idea whY? is there something wrong with the script that needs to be fixed..abhijithtk Reputation Points: 10Solved Threads: 0

Newbie Poster abhijithtk is offline Offline3 postssince Jun 2010Permalink 16 Days Ago

0Re: __END__ in PERL syntaxClick to Expand / Collapse Quote originally posted by abhijithtk ...

Ok Question..

http://perldoc.perl.org/Pod/Usage.html

Have a look under "Recommended Usage" at the bottom of the page. I copied thescript and tried to run it on my machine. For some reason it doesnt display anything if igive the -man or -help options.

Any idea whY? is there something wrong with the script that needs to be fixed..

hmm, works here. "-help" actually gives me 2 versions and -man gives me a man styleoutput (I named it use.pl):Perl Syntax (Toggle Plain Text)


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1.$ perl use.pl

2.use.pl: No files given.

3.

Usage:4.sample [options] [file ...]

5.

6.Options: -help brief help message -man full documentation

$ perl use.pl use.pl: No files given. Usage: sample[options] [file ...] Options: -help brief help message -man full documentationPerl Syntax (Toggle Plain Text)

1.$ perl use.pl -help

2.Usage:

3.sample [options] [file ...]

4.

5.Options: -help brief help message -man full documentation

6.

7.Options:

8.-help Print a brief help message and exits.

9.

10.-man Prints the manual page and exits.

$ perl use.pl -help Usage: sample [options] [file ...]Options: -help brief help message -man full documentation Options: -help Print a brief help message and exits. -man Prints the manual page and exits.What sort of machine are you running it on?


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afbachReputation Points: 11Solved Threads: 0

Newbie Poster afbach is offline Offline

7 postssince Mar 2006

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