[Mailinglist] pausing & resuming Wget for downloading ISOs
Zaheer Mohamed Kozhakkaniyil
zaheermk at email.com
Tue Oct 2 23:24:08 IST 2007
Thanks all, for your prompt & kind response.
Brijesh, what I feel is that the server does support resuming, otherwise
Wget wouldn't have been able to finish the download, right?
Sunjith P S, That was an excellent / new piece of info about rsync. This
is a great tool, if I have undestood you correctly... so that the same
file does not have to be downloaded again. This is a welcome relief. And
I was not really aware of sha1sum also.
And Anirudh, I never used to check md5sum, because, I used to think that
if it has finished downloading properly, then the md5sum should be
matching. But I have realized that it won't always be true.
Anyway... in this case of mine, the md5sum, I have checked now, and it is
matching.
So the issue now, is the CD drive, CD media or the burning S/W. I use a
CDRW nowadays, because I 'burnt' my hands the first time I burnt on a CDR
and it didn't work. But, using a CDRW shouldn't be a problem, I guess.
What do you say?
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Today's Topics:
1. pausing & resuming Wget for downloading ISOs
(Zaheer Mohamed Kozhakkaniyil)
2. Re: pausing & resuming Wget for downloading ISOs (gingerjoos)
3. Re: pausing & resuming Wget for downloading ISOs (Sunjith P S)
4. Re: pausing & resuming Wget for downloading ISOs (BKR)
From: Zaheer Mohamed Kozhakkaniyil <zaheermk at email.com>
To: mailinglist at ilug-cochin.org
Subject: [Mailinglist] pausing & resuming Wget for downloading ISOs
Date: Mon, 1 Oct 2007 23:08:29 +0530
Hello All,
I am trying to download some ISOs using Wget (version 1.10.x)... I
downloaded around 3 - 4 times, the same distro ISO (& a different
distro) from different sites. And after downloding, burnt it (tried
both Nautilus CD Burner & Brasero alternatively in OpenSuse 10.1 &
Dreamlinux 2.2 respectively). The system does detect the CD and
starts to boot from it ... but halts in the loading of the kernel /
initializing during booting.
Now, the problem could (or would) be, because I am stopping Wget, by
Ctrl-C, when I leave every morning for office (I usually unplug the
monitor and leave the system ON overnight for downloading) and resume
it after I reach back home. But sadly, none of these ISO downloads
have returned me a successful result. I also tried Ctrl-Z for
stopping Wget (which 'seems' to be the right way to pause Wget), but
even that is giving the same result.
So... could somebody tell me the correct way to pause Wget when
downloading big ISOs? My case is, I would have to pause the download
in between and then resume later. Or is Wget not suitable for this
sort of activity? I've searched & read some help / info / manuals on
Wget, but none of them seems to give a specific reply to this issue.
Even now, I am parallely trying to get more info on Wget.
The syntax which I used is given below:
wget -c http://linorg.usp.br/iso/dreamlinux/DL_2.2_070701MMGL_en.iso
-O /mnt/hda8/Distros/DL22GL.iso
Zaheer M K
GNU/Linux user #351122
Registered at http://counter.li.org
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From: gingerjoos <gingerjoos at gmail.com>
To: This List discusses GNU/Linux & GNU, GPL Software
<mailinglist at ilug-cochin.org>
Subject: Re: [Mailinglist] pausing & resuming Wget for downloading
ISOs
Date: Tue, 2 Oct 2007 09:09:16 +0530
Zaheer, are you sure it's a problem with wget?
All distros come with an MD5 checksum for their ISOs. Check the image
before burning it. http://puppylinux.org/wikka/Md5
> ~/linuxisos/PCLinuxOS$ md5sum -c pclinuxos-2007.md5sum
> pclinuxos-2007.iso: OK
>
>
> ~/linuxisos/PCLinuxOS$ ls
> pclinuxos-2007.iso pclinuxos-2007.md5sum pclinuxos.url
> ~/linuxisos/PCLinuxOS$ cat pclinuxos-2007.md5sum
> cf31f44513c9b30caaa1f1d2c382c033 pclinuxos-2007.iso
> ~/linuxisos/PCLinuxOS$ md5sum pclinuxos-2007.iso
> cf31f44513c9b30caaa1f1d2c382c033 pclinuxos-2007.iso
>
>
~~~~Anirudh
On 10/1/07, Zaheer Mohamed Kozhakkaniyil wrote:
> Hello All,
>
> I am trying to download some ISOs using Wget (version
> 1.10.x)... I downloaded around 3 - 4 times, the same distro ISO
> (& a different distro) from different sites. And after
> downloding, burnt it (tried both Nautilus CD Burner & Brasero
> alternatively in OpenSuse 10.1 & Dreamlinux 2.2 respectively).
> The system does detect the CD and starts to boot from it ... but
> halts in the loading of the kernel / initializing during booting.
>
>
--
Orbis Non Sufficit
From: Sunjith P S <sunjithps at gmail.com>
To: This List discusses GNU/Linux & GNU, GPL Software
<mailinglist at ilug-cochin.org>
Subject: Re: [Mailinglist] pausing & resuming Wget for downloading
ISOs
Date: Tue, 2 Oct 2007 09:02:19 +0530
Hello Zaheer,
You can pause wget with ctrl+c and resume later with -c option. I
have used this method successfully. But I have a few suggestions for
you. Most distro ISOs will have md5 and/or sha checksum available on
their sites. Download it and verify the checksum to make sure your
download was successful and without errors after the ISO is
completely downloaded. You can verify md5 sum as follows:
* --------------------
md5sum -c md5sum_file
* --------------------
[assuming the md5sum_file and iso_file are in the same dir]
If successful, it would display like:
=================
$ md5sum -c test.iso.md5
test.iso: OK
=================
Similarly for sha1sum:
=================
$ sha1sum -c test.iso.sha1
test.iso: OK
=================
If the ISO tested ok, you know for sure that the copy you have is
identical to the one on the server. If they provide only the md5sum
or sha1sum as text string instead of file on their site, just do
"md5sum iso_file" or "sha1sum iso_file" and verify that the output
matches the string provided on the site.
Even if checksum fails, don't panic. In most cases you won't have to
redo the entire download, thanks to rsync. Most distros will have
rsync servers as well. Locate one such server and rsync the file. It
will only download the difference between the file on the server and
the one on your machine. After rsync, do check the checksum again
before burning. Example of rsync (see man pages or help for options):
=================
rsync -av --progress --stats --compress \
rsync://ftp.fi.muni.cz/pub/linux/fedora/linux/releases/7/Fedora/i386/iso/F-7-i386-DVD.iso\
F-7-i386-DVD.iso
=================
You can pause rsync with ctrl+c and resume later (no additional
option for resume since it is only transfering the difference between
files). But rsync is not recommended for whole download since it is a
little slower for multi-session download as it has to compute the
difference each time. So it is recommended for fixing corrupt files.
I would also like to recommend prozilla download accelerator in place
of wget for downloading big files. It's much faster and rarely
corrupts files. A download can be resumed with "-r" option. If resume
is not specified it asks if you would like to overwrite or resume.
Regards,
Sunjith
On Monday 01 October 2007, Zaheer Mohamed Kozhakkaniyil wrote:
> Hello All,
>
> I am trying to download some ISOs using Wget (version 1.10.x)... I
> downloaded around 3 - 4 times, the same distro ISO (& a different
> distro) from different sites. And after downloding, burnt it (tried
> both Nautilus CD Burner & Brasero alternatively in OpenSuse 10.1 &
> Dreamlinux 2.2 respectively). The system does detect the CD and
starts
> to boot from it ... but halts in the loading of the kernel /
> initializing during booting.
>
> Now, the problem could (or would) be, because I am stopping Wget,
by
> Ctrl-C, when I leave every morning for office (I usually unplug the
> monitor and leave the system ON overnight for downloading) and
resume
> it after I reach back home. But sadly, none of these ISO downloads
have
> returned me a successful result. I also tried Ctrl-Z for stopping
Wget
> (which 'seems' to be the right way to pause Wget), but even that is
> giving the same result.
>
> So... could somebody tell me the correct way to pause Wget when
> downloading big ISOs? My case is, I would have to pause the
download in
> between and then resume later. Or is Wget not suitable for this
sort of
> activity? I've searched & read some help / info / manuals on Wget,
but
> none of them seems to give a specific reply to this issue. Even
now, I
> am parallely trying to get more info on Wget.
>
> The syntax which I used is given below:
>
> wget -c
http://linorg.usp.br/iso/dreamlinux/DL_2.2_070701MMGL_en.iso -O
> /mnt/hda8/Distros/DL22GL.iso
>
>
> Zaheer M K
> GNU/Linux user #351122
> Registered at http://counter.li.org
From: BKR <bkr.nair at gmail.com>
To: This List discusses GNU/Linux & GNU, GPL Software
<mailinglist at ilug-cochin.org>
Subject: Re: [Mailinglist] pausing & resuming Wget for downloading
ISOs
Date: Tue, 2 Oct 2007 09:56:07 +0530
maybe the server does not support resuming?
Brijesh
On 10/1/07, Zaheer Mohamed Kozhakkaniyil <zaheermk at email.com > wrote:
Hello All,
I am trying to download some ISOs using Wget (version 1.10.x)...
I downloaded around 3 - 4 times, the same distro ISO (& a
different distro) from different sites. And after downloding,
burnt it (tried both Nautilus CD Burner & Brasero alternatively
in OpenSuse 10.1 & Dreamlinux 2.2 respectively). The system does
detect the CD and starts to boot from it ... but halts in the
loading of the kernel / initializing during booting.
Now, the problem could (or would) be, because I am stopping Wget,
by Ctrl-C, when I leave every morning for office (I usually
unplug the monitor and leave the system ON overnight for
downloading) and resume it after I reach back home. But sadly,
none of these ISO downloads have returned me a successful result.
I also tried Ctrl-Z for stopping Wget (which 'seems' to be the
right way to pause Wget), but even that is giving the same
result.
So... could somebody tell me the correct way to pause Wget when
downloading big ISOs? My case is, I would have to pause the
download in between and then resume later. Or is Wget not
suitable for this sort of activity? I've searched & read some
help / info / manuals on Wget, but none of them seems to give a
specific reply to this issue. Even now, I am parallely trying to
get more info on Wget.
The syntax which I used is given below:
wget -c
http://linorg.usp.br/iso/dreamlinux/DL_2.2_070701MMGL_en.iso -O
/mnt/hda8/Distros/DL22GL.iso
Zaheer M K
GNU/Linux user #351122
Registered at http://counter.li.org
-- We've Got Your Name @ Mail.com !!!
Get a FREE E-mail Account Today - Choose From 100+ Domains
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