Spake baris nema on Monday, July 24, 2006 at 05:44PM -0400:
> The input files I'm processing is currently on the order of 6megs
> (~100,000 lines), so
> I'm thinking an array is out, the output file is smaller, usually.
>
> Would it be possible to search the output file without having to close
> it (maybee using
> a different file handle)?
>
> I'm currently doing the processing using bash, but due to the number of
> loops want to
> port it over to perl, I'm quite new at perl, so any code examples would
> be helpfull.
>
> currently it's (perlified pseudo code):
>
> read line in from input file;
> $criticalpart = result of several operations on line;
> $existstat = `grep -c "$criticalpart" "$outputfile"`; #trying to
> replace this line with perl code
> if ( $existstat == 0 );
> {
> $processedcriticalpart = [some more operations on $criticalpart];
> print $outputfile "$processedcriticalpart";
> }
What does the "critcalpart" look like?
And yes, you can 'rewind' a file and start reading/writing from the
beginning.
see perldoc -f seek for rewinding. Note, you'd also need to open the
file for both reading *and* writing.
Anyway, if the critical part is always the same size (or a decidable
size), you won't have to do this ugly rewinding thing... Give us some
more details. :-)
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