Re: Re: Re: Is it possible to alter a flat file in memory?

The magic of the -i doesn't preclude the file from being opened, read, written, and closed does it?

It renames the given file then creates an empty file in it's place and writes to that (see. the -i section of perlrun).

I think for all intents and purposes, it meets the OP's needs

Indeed. I considered giving a solution where the code did most of the work inplace, but I figured that the OP just wanted ease of use (that's why they're using perl afterall :)

Besides - Tie::File has to read the entire file to index the newlines as well for the array - or am I wrong about that too?

It does indeed read the whole file into memory, but as its Dominus' code it's all terrifically optimal :)
HTH

_________ broquaint

Comment on Re: Re: Re: Is it possible to alter a flat file in memory?

Replies are listed 'Best First'.
Re^4: Is it possible to alter a flat file in memory? by Limbic~Region (Chancellor) on Apr 12, 2006 at 14:50 UTC
broquaint, I have been going through my old nodes looking for interesting stuff. I aplogize for a reply almost 3 years later. There is a slight difference between my statement of "has to read the entire file to index the newlines..." and your statement of "It does indeed read the whole file into memory,.." As best as I understand Tie::File, it doesn't actually read the file into memory. It reads the entire file yes, but only enough stays in memory as is needed while it searches for input record separators for indexing. Cheers - L~R	[reply]

Replies are listed 'Best First'.

Re^4: Is it possible to alter a flat file in memory?
by Limbic~Region (Chancellor) on Apr 12, 2006 at 14:50 UTC

broquaint

There is a slight difference between my statement of
"has to read the entire file to index the newlines..."
and your statement of
"It does indeed read the whole file into memory,.."

Tie::File

Cheers - L~R

[reply]