I think I've discovered something strange. I am trying to iterate through a text file that is in fastq format which is basically something like: 
@Name 
AGCATATA...whatever nucleotide sequence
+
KKKKKKKK...quality score

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I usually don't have a problem with this because I usually buffer the whole file into a hash and sort through it after. This time I wanted to make if then decisions on the fly. 
For (<INFILE>) {
   if (/^@(\S+)/) {
      print $1;
      my $seq = <INFILE>;
   }
}

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why does this throw an error. The strange thing is if instead of assigning the filehandle and just have it iterate once with a "or die" command it will tell me it died at the END of the file instead of the next line??

In reply to Iterating single line within a For Loop by diyaz

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