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open statement help needed

Posted on 2007-11-20
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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");
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Question by:naseeam
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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.
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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.
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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.
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Author Closing Comment

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