Solved

open statement help needed

Posted on 2007-11-20
4
184 Views
Last Modified: 2010-04-21
In the following code, what does open TEMP do?  Is TEMP a file.  ddump dumps the debugging information.  Is it dumped in the TEMP file.  If TEMP is created, in which directory can I find it?

open TEMP, "$ddump -D $elf|" or die("\nError dumping file!\n");
0
Comment
Question by:naseeam
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 39

Expert Comment

by:Adam314
ID: 20320896
In this case, open will run the command "$ddump -D $elf", and create a filehandle named TEMP as a pipe from that program.
When your program reads from TEMP, it will be reading the output from the $ddump program.
0
 
LVL 1

Author Comment

by:naseeam
ID: 20320978
I thought there is a file coupled with every file handle.  Which file goes with TEMP filehandle.  
It looks like the output of ddump program are stored in TEMP filehandle, instead of a file.
Am I understanding this correctly?

Thanks.
0
 
LVL 39

Accepted Solution

by:
Adam314 earned 500 total points
ID: 20321086
From the documentation for open:
    http://perldoc.perl.org/functions/open.html
"if the filename ends with a '|' , the filename is interpreted as a command which pipes output to us"

So, in this case there is no actual file.
The output from ddump is stored in the TEMP filehandle - you are correct on this part.
0
 
LVL 1

Author Closing Comment

by:naseeam
ID: 31410143
Quick Response.  Almost Immediate.  
0

Featured Post

[Webinar] How Hackers Steal Your Credentials

Do You Know How Hackers Steal Your Credentials? Join us and Skyport Systems to learn how hackers steal your credentials and why Active Directory must be secure to stop them. Thursday, July 13, 2017 10:00 A.M. PDT

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I've just discovered very important differences between Windows an Unix formats in Perl,at least 5.xx.. MOST IMPORTANT: Use Unix file format while saving Your script. otherwise it will have ^M s or smth likely weird in the EOL, Then DO NOT use m…
Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Six Sigma Control Plans

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question