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Full Discussion: Optimised way for search & replace a value on one line in a very huge file (File Size is 24 GB).
Top Forums Shell Programming and Scripting Optimised way for search & replace a value on one line in a very huge file (File Size is 24 GB). Post 302552326 by Corona688 on Friday 2nd of September 2011 12:05:05 PM
Old 09-02-2011
There is no fundamental operation for inserting or deleting data in the middle of a file. You have to rewrite the entire file after the edit.

A 24 gigabyte file in 11 minutes is 37 megabytes per second, which is actually a pretty impressive transfer rate! It's probably maxed out your disk or bus speed now, changing the program won't help significantly. It might help to write the output to a different disk than you're reading from.

If you could use yazu's suggestion of always keeping the string the same length, so the data afterwards doesn't need to be rewritten, that would let the edit happen in a fraction of a second...
 

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LEARN ABOUT HPUX

transmission-edit

TRANSMISSION-EDIT(1)					    BSD General Commands Manual 				      TRANSMISSION-EDIT(1)

NAME

     transmission-edit -- command-line utility to modify .torrent files' announce URLs

SYNOPSIS

     transmission-edit [-h] [-a url] [-d url] [-r search replace] torrentfile(s)

DESCRIPTION

     transmission-edit command-line utility to modify .torrent files' announce URLs

OPTIONS

     -h --help
	     Show a short help page and exit.

     -a --add URL
	     Add an announce URL to the torrent's announce-list if it's not already in the list

     -d --delete URL
	     Remove an announce URL from the torrent's announce-list

     -r --replace search replace
	     Substring search-and-replace inside a torrent's announce URLs. This can be used to change an announce URL when the tracker moves or
	     your passcode changes.

EXAMPLES

     Update a tracker passcode in all your torrents:

	   $ transmission-edit -r old-passcode new-passcode ~/.config/transmission/torrents/*.torrent

AUTHORS

     Jordan Lee

SEE ALSO

     transmission-create(1), transmission-daemon(1), transmission-edit(1), transmission-gtk(1), transmission-qt(1), transmission-remote(1),
     transmission-show(1)

     http://www.transmissionbt.com/

BSD
								   June 9, 2010 							       BSD
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