Hey.. not 'impossible'.. just *really annoying*... ie, firing up debugfs
or whatever they're using these days to manipulate filesystem internals. :)
Sorry, but the impossible in all caps is just begging for
technicalities.. :-)
-Brian
James Washer wrote:
If he wanted to lop off the first xxx bytes, without "touching" the remainder of the file... then it's IMPOSSIBLE under linux/unix.
You mention flat-file-database... it's that's the case, I hope he can stop
updates while removing the first 300 lines... else, the problem is just a bit
harder (in fact, it can become impossible if his data base engine does not use
some form of file locking.)
- jim
On Wed, 28 Jun 2006 17:50:14 -0700 (PDT)
Sebastian Smith <[EMAIL PROTECTED]> wrote:
I think what Grant meant by "in place" was that he didn't want to read the
entire file, just lop off the first 300 lines -- perhaps he can correct
me. I'm guessing storage space isn't an issue. Regardless, I don't know
of a way to do that.
You really need to get away from those flat file databases Grant ;)
On Wed, 28 Jun 2006, James Washer wrote:
it's the "working in place" that makes this difficult, else there are countless
ways to do this, including the simple perl
perl -ne 'next unless $. >300;print'
On Wed, 28 Jun 2006 17:26:47 -0700
"Brandon Mitchell" <[EMAIL PROTECTED]> wrote:
This is an interesting problem, and seems to be revealing a little bit
about what type of user/admin is in each of us.
So where's Nick with an Emacs Lisp macro for this task? :P
On 6/28/06, Anna <[EMAIL PROTECTED]> wrote:
find out which byte terminates the first 300 lines. maybe...
~$ BYTES=$(head -300 nameofbigfile.txt | wc -c)
then use that info with dd skip the first part of the input file...
~$ dd if=nameofbigfile.txt of=truncatedversion.pl ibs=$BYTES skip=1
one of many ways, I'm sure. I think this way should be pretty fast
because it works on a line by line basis for just a small part of the
file. The rest, with dd, is done in larger pieces.
- Anna
On Wed, Jun 28, 2006 at 01:01:03PM -0700, Grant Kelly wrote:
Alright unix fans, who can answer this the best?
I have a text file, it's about 2.3 GB. I need to delete the first 300
lines, and I don't want to have to load the entire thing into an
editor.
I'm trying `sed '1,300d' inputfile > output file` but it's taking a
long time (and space) to output everything to the new file.
There has got to be a better way, a way that can do this in-place...
Grant
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If UNIX doesn't have the solution you have the wrong problem.
UNIX is simple, but it takes a genius to understand it's simplicity.
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