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jdles
Newbie
Joined: 04 Aug 2005
Posts: 3
  
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 Posted: Fri Aug 05, 2005 2:28 am Post subject: File input |
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| I'm new to Perl and trying to figure out ways to read things from a file. I can get the whole thing with @data=<DAT>; , or a character at a time with getc(), but are there any other options? I'll be reading pretty big files. Can I read until the next newline, for instance? Or until I see a ' '? |
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draget
Not Yet a God
Joined: 29 Dec 2004
Posts: 367
Location: Australia
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| Posted: Fri Aug 05, 2005 9:20 am Post subject: |
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think loops.
i'd read it all into an array, then just loop through the array,. |
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eric256
The Keymaker
Joined: 03 May 2006
Posts: 2292
Location: Colorado
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| Posted: Fri Aug 05, 2005 2:04 pm Post subject: |
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You can read it all into your @data array and then loop into it. However you might end up with some memory concerns that way if the file is large. In those cases you can read line by line.
Will read a single line of data. It will return undef when you reach the end of the file....so you can do
| Code: | while (my $line = <DATA>){
# do something with each $line here
}
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And that will read every line of the file, executing the middle code once for each line.
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Eric256
Proud previous owner and current admin of Bot-depot.com |
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darkmonkey
The Merovingian
Joined: 18 Apr 2004
Posts: 2557
Location: London, England
votes: 7
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| Posted: Thu Aug 11, 2005 10:04 pm Post subject: |
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With big files, look into using the "tie" module. That's more advance than newb though.
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