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Weird PERL script behaviour [on hold]

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-2

Normally, I turn on Apache on WIndows, and place my scripts in the CGI-BIN, and call them from the browser ... as per a normal web based arrangement.

But I'm working on an idea that doesn't need a browser to show output, so I thought I'd see if PERL can run on its own, ie from Windows Command Line. This is where it gets interesting !

I have this little script:

#!/usr/bin/perl



open(TEST, ">","DUMMY.txt" or die 'could not open file');

print TEST "Will this write?";

close(TEST);



print "script has run";



1; 

Now "DUMMY.txt" does not exist, so it SHOULD print the "or die" statement. It doesn't. If a file DOES exist, it should print to that file. It doesn't. All I get each time is "script has run", (so at least I know it's being executed)

Oh, I also thought it might be because the CGI-BIN was reserved, so I tried the full path to the public_html folder above CGI-BIN. That didn't work either!

Perl version shows as V5.20.1

My goal is to start script (via commannd line) then have it running as a background on Windows until it encounters a key press to exit, monitoring a folder. and then sending any PDF dropped into that folder silently to printer via GhostScript. (I also have to send a single line of data from a HTML/Javascript form - one way only - so program will not return any data to browser) But I need to find why I can't even save a text file at present !

NB: When did the arrow become an individual entity? I used to write (TEST, ">dummy.txt");

perl

share|improve this question

asked 13 hours ago

CristofayreCristofayre

12

put on hold as off-topic by Michael Hampton♦ 10 hours ago

• This question does not appear to be about server, networking, or related infrastructure administration within the scope defined in the help center.

If this question can be reworded to fit the rules in the help center, please edit the question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have just tried it with 'strict' and 'warnings' and it reports "useless use of a constant ("TEST") in void context ... useless use of a constant (">" in void context" ... Can't use string "TESTME.txt" as a symbol ref whilst using strict ..." WHAT ???
  
  – Cristofayre
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Got rid of the above by moving the close bracket to before the "or die" statement so open command only has 3 values ... but still don't work !
  
  – Cristofayre
  12 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Checked the time stamp of the file it's supposed to be writing out too: Still the same as when I started 2hrs ago ... so confirms it is not even opening file, despite the script saying it's run.
  
  – Cristofayre
  12 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Programming questions need to be asked on Stack Overflow.
  
  – Michael Hampton♦
  10 hours ago
  

  
  
  
  

add a comment | 

-2

Normally, I turn on Apache on WIndows, and place my scripts in the CGI-BIN, and call them from the browser ... as per a normal web based arrangement.

But I'm working on an idea that doesn't need a browser to show output, so I thought I'd see if PERL can run on its own, ie from Windows Command Line. This is where it gets interesting !

I have this little script:

#!/usr/bin/perl



open(TEST, ">","DUMMY.txt" or die 'could not open file');

print TEST "Will this write?";

close(TEST);



print "script has run";



1; 

Now "DUMMY.txt" does not exist, so it SHOULD print the "or die" statement. It doesn't. If a file DOES exist, it should print to that file. It doesn't. All I get each time is "script has run", (so at least I know it's being executed)

Oh, I also thought it might be because the CGI-BIN was reserved, so I tried the full path to the public_html folder above CGI-BIN. That didn't work either!

Perl version shows as V5.20.1

My goal is to start script (via commannd line) then have it running as a background on Windows until it encounters a key press to exit, monitoring a folder. and then sending any PDF dropped into that folder silently to printer via GhostScript. (I also have to send a single line of data from a HTML/Javascript form - one way only - so program will not return any data to browser) But I need to find why I can't even save a text file at present !

NB: When did the arrow become an individual entity? I used to write (TEST, ">dummy.txt");

perl

share|improve this question

asked 13 hours ago

CristofayreCristofayre

12

put on hold as off-topic by Michael Hampton♦ 10 hours ago

• This question does not appear to be about server, networking, or related infrastructure administration within the scope defined in the help center.

If this question can be reworded to fit the rules in the help center, please edit the question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have just tried it with 'strict' and 'warnings' and it reports "useless use of a constant ("TEST") in void context ... useless use of a constant (">" in void context" ... Can't use string "TESTME.txt" as a symbol ref whilst using strict ..." WHAT ???
  
  – Cristofayre
  13 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Got rid of the above by moving the close bracket to before the "or die" statement so open command only has 3 values ... but still don't work !
  
  – Cristofayre
  12 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Checked the time stamp of the file it's supposed to be writing out too: Still the same as when I started 2hrs ago ... so confirms it is not even opening file, despite the script saying it's run.
  
  – Cristofayre
  12 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Programming questions need to be asked on Stack Overflow.
  
  – Michael Hampton♦
  10 hours ago
  

  
  
  
  

add a comment | 

Normally, I turn on Apache on WIndows, and place my scripts in the CGI-BIN, and call them from the browser ... as per a normal web based arrangement.

But I'm working on an idea that doesn't need a browser to show output, so I thought I'd see if PERL can run on its own, ie from Windows Command Line. This is where it gets interesting !

I have this little script:

#!/usr/bin/perl



open(TEST, ">","DUMMY.txt" or die 'could not open file');

print TEST "Will this write?";

close(TEST);



print "script has run";



1; 

Now "DUMMY.txt" does not exist, so it SHOULD print the "or die" statement. It doesn't. If a file DOES exist, it should print to that file. It doesn't. All I get each time is "script has run", (so at least I know it's being executed)

Oh, I also thought it might be because the CGI-BIN was reserved, so I tried the full path to the public_html folder above CGI-BIN. That didn't work either!

Perl version shows as V5.20.1

My goal is to start script (via commannd line) then have it running as a background on Windows until it encounters a key press to exit, monitoring a folder. and then sending any PDF dropped into that folder silently to printer via GhostScript. (I also have to send a single line of data from a HTML/Javascript form - one way only - so program will not return any data to browser) But I need to find why I can't even save a text file at present !

NB: When did the arrow become an individual entity? I used to write (TEST, ">dummy.txt");

perl

share|improve this question

asked 13 hours ago

CristofayreCristofayre

12

#!/usr/bin/perl



open(TEST, ">","DUMMY.txt" or die 'could not open file');

print TEST "Will this write?";

close(TEST);



print "script has run";



1; 

share|improve this question

asked 13 hours ago

CristofayreCristofayre

12

share|improve this question

asked 13 hours ago

CristofayreCristofayre

12

asked 13 hours ago

CristofayreCristofayre

12

asked 13 hours ago

CristofayreCristofayre

12