Re: Search Efficiency


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Re: Search Efficiency

by Cirollo (Friar)

on Jul 11, 2001 at 19:00 UTC ( [id://95708]=note: print w/replies, xml )

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in reply to Search Efficiency

Perl doesn't read in the entire file each time through that loop. Each time through the loop, Perl just reads the next line from the still-opened file.

A few tidbits that might come in handy if you're doing anything more complex:

If you need to know the current line number, look at the $. variable (dollar dot).

The seek function can be used to go to a specific part of a file without reading the whole thing. The tell function returns the current file position in bytes, based at 0.

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Re: Re: Search Efficiency
by particle (Vicar) on Jul 11, 2001 at 19:37 UTC

Is there anyway to tell perl, "hey, you have already gone through x lines, don't start over at the beginning of the file when you loop back through?

by the way, always use strict and perl -w to keep your code on it's very best behaviour.

~Particle

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