Large file - Opening n head lines

[Ni Va]

Hi All,

Is it possible to open a Large File Vim but just only few beginning lines of it, edit one of these 50 first lines and then save and quit ?

Thank you

NV

[Lifepillar]

On 2022-03-17, Ni Va <niva...@gmail.com> wrote:
> Is it possible to open a Large File Vim but just only few beginning lines
> of it, edit one of these 50 first lines and then save and quit ?

I don't think that is possible with Vim without the help of some
pre/post-processing tool, but... Vim can edit pretty large files
relatively quickly, if set up properly. Have you tried playing with
Vim's settings already?

Of course, all depends on what "large" and "quick" mean to you. And
I believe that the line length of the edited files is also an important
factor.

Life.

[Steve Litt]

Ni Va said on Thu, 17 Mar 2022 01:41:08 -0700 (PDT)

>Hi All,
>
>Is it possible to open a Large File Vim but just only few beginning
>lines of it, edit one of these 50 first lines and then save and quit ?

head -n 50 bigfile.txt | vim -
# NOTE: Save as bigfile.new
tail +51 bigfile.txt >> bigfile.new
# NOTE: bigfile.new is now your edited file.

If you do it often, you can put it in a shellscript, and can even
rename the original to .bak.

HTH

SteveT

Steve Litt
March 2022 featured book: Making Mental Models: Advanced Edition
http://www.troubleshooters.com/mmm

[M]

чт, 17 мар. 2022 г. в 11:41, Ni Va <niva...@gmail.com>:

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Inserting data, in general case (i.e. if the size may change), is non-trivial. That is, one has to append a copy of the original file's tail and then flush everything to disk again.So even if you do

    :read !head -n 20 foobar.txt

and edit it, you still must do

    :saveas temp

    :!tail -n +21 foobar.txt >>temp

    :!mv temp foobar.txt

to create a new version. And it does not look like some gain to me.

Regards,

Matvey

[Tim Chase]

On 2022-03-17 01:41, Ni Va wrote:
> Is it possible to open a Large File Vim but just only few beginning
> lines of it, edit one of these 50 first lines and then save and
> quit ?

I don't think it's readily doable inside vim, but if I had such a
situation, I'd split it into the two portions like

$ sed -n -e '1,50w head.txt' -e '51,$w tail.txt' bigfile.txt

I could then edit head.txt easily and write it back out. I can then
recombine the pieces when done:

$ cat head.txt tail.txt > edited_bigfile.txt

-tim

[Stan Brown]

On 2022-03-17 02:55, Lifepillar wrote:
> On 2022-03-17, Ni Va <niva...@gmail.com> wrote:
>> Is it possible to open a Large File Vim but just only few beginning lines
>> of it, edit one of these 50 first lines and then save and quit ?
>
> I don't think that is possible with Vim without the help of some
> pre/post-processing tool, but... Vim can edit pretty large files
> relatively quickly, if set up properly. Have you tried playing with
> Vim's settings already?

What settings do you have in mind? I wasn't aware that Vim needed to be
set up differently for files of different sizes.

--
Stan Brown
Tehachapi, CA, USA
https://BrownMath.com

[Charles Campbell]

Vim doesn't "need" to be set up differently for large files. However,
options can be selected to make it faster.
See http://www.drchip.org/astronaut/vim/index.html#LARGEFILE for a
plugin that helps with large files.

Chip Campbell

[Ni Va]

Sorry for late answer, that was to modify a 50Go VMware .vmdk file. Just to modify disk space allocation. 😊

I tried this morning. Vim succeed to open but not to save and close. 

NV

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[Ni Va]

Thank you Charles. Many years i use your largefile.vim. Thank you Charles. 😊 

Le jeu. 17 mars 2022 à 18:50, Charles Campbell <camp...@drchip.org> a écrit :

[Ni Va]

Thank you Steve i think you sum up the more efficient way. Thank you. Nicolas. 😉 

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[Ni Va]

Thank you all of you.