Copy paste with checksum check

[alaios]

Dear all,
I am looking for a copy command that I would be absolutely sure that after is finished my file is identical bit my bit.
In other words which is the command that does copy and you would be using it when you know that you have a large file of super-extra-ultra confidential data and after the copy is finished you have to delete the source ?

Regards
Alex

[robin_listas]

On 2012-04-24 08:06, alaios wrote:
>
> Dear all,
> I am looking for a copy command that I would be absolutely sure that
> after is finished my file is identical bit my bit.
> In other words which is the command that does copy and you would be
> using it when you know that you have a large file of super-extra-ultra
> confidential data and after the copy is finished you have to delete the
> source ?

Command line, copy file, then do a byte by byte comparison of source and
destination, then delete source if needed. No such tool available as click
and point, afaik.

–
Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)

[alaios]

@robin_listas

On 2012-04-24 08:06, alaios wrote:
>
> Dear all,
> I am looking for a copy command that I would be absolutely sure that
> after is finished my file is identical bit my bit.
> In other words which is the command that does copy and you would be
> using it when you know that you have a large file of super-extra-ultra
> confidential data and after the copy is finished you have to delete the
> source ?

Command line, copy file, then do a byte by byte comparison of source and
destination, then delete source if needed. No such tool available as click
and point, afaik.

–
Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)

How I can do this byte by byte comparison? Does a checksum check suffice?

[robin_listas]

On 2012-04-24 10:06, alaios wrote:

> How I can do this byte by byte comparison? Does a checksum check
> suffice?

diff, cmp… or checksums, of course. The paranoid will not use checksums.

–
Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)

[user]

Carlos E. R. wrote:

> On 2012-04-24 10:06, alaios wrote:
>
>> How I can do this byte by byte comparison? Does a checksum check
>> suffice?
>
> diff, cmp… or checksums, of course. The paranoid will not use checksums.
>

But with checksums you can check backups integrity also in future.

–
Viljo

[robin_listas]

On 2012-04-24 14:54, Viljo Mustonen wrote:
> Carlos E. R. wrote:

> But with checksums you can check backups integrity also in future.

Ah, yes, absolutely

–
Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)

[alaios]

One more question came to mind last night,

Let,s say that I have moved 10.000 files to my network to my local disk. What can be an effective way to do this bit by bit comparison between all these folders and files. How to keep any errors to specific file so to read it later?

Regards
Alex

[robin_listas]

On 2012-04-27 07:56, alaios wrote:
>
> One more question came to mind last night,
>
> Let,s say that I have moved 10.000 files to my network to my local
> disk. What can be an effective way to do this bit by bit comparison
> between all these folders and files. How to keep any errors to specific
> file so to read it later?

Midnight commander (mc).

It can compare the contents of two directories, and mark different or
missing files. What it doesn’t do is checksum check, for that I would do my
own script.

And if you have to compare over the network, checksum comparison is the
thing to do. Hold on… md5sum does check a directory, automatically. You
just give the program a file with checksums and filenames, it will verify
the entire list. With “–quiet” it will only talk for bad files.

What it does not do is verification of a tree.

–
Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)

[alaios]

just to add that I did the job with this one

rsync -rvnc website/ laptop:projects/website/

@robin_listas

On 2012-04-27 07:56, alaios wrote:
>
> One more question came to mind last night,
>
> Let,s say that I have moved 10.000 files to my network to my local
> disk. What can be an effective way to do this bit by bit comparison
> between all these folders and files. How to keep any errors to specific
> file so to read it later?

Midnight commander (mc).

It can compare the contents of two directories, and mark different or
missing files. What it doesn’t do is checksum check, for that I would do my
own script.

And if you have to compare over the network, checksum comparison is the
thing to do. Hold on… md5sum does check a directory, automatically. You
just give the program a file with checksums and filenames, it will verify
the entire list. With “–quiet” it will only talk for bad files.

What it does not do is verification of a tree.

–
Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)

[martin_helm]

Am 27.04.2012 14:46, schrieb alaios:
>
> just to add that I did the job with this one
>
>
> Code:
> --------------------
> rsync -rvnc website/ laptop:projects/website/
> --------------------
>
>
Since the man page of rsync says

Note that rsync always verifies that each transferred file was
correctly reconstructed on the receiving side by checking a
whole-file checksum that is generated as the file is trans-
ferred, but that automatic after-the-transfer verification has
nothing to do with this option’s before-the-transfer “Does this
file need to be updated?” check.

that should be a very safe operation to do that copy with rsync.

–
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