El Tue, 09 Aug 2011 19:20:45 -0400 linux <liuberperez....@infomed.sld.cu> escribió: > Saludos lista estaba descargando con wget y todo hiba ok, he > descargado bastantes archivos, pero tube que detener el wget y cuando > lo pongo a descargar de nuevo me bajja lo mismo que ya tenia bajado, > alguie sabe que parametro tengo que ponerle para que el wget me > revise lo que ya el descargo hasta donde lo descargo y comience a > partir de ahi, y no que me vuelva a bajar en el mismo lugar que ya > esta descargado los archivos los mismos archivos? > > saludos > > LIuber > > -- > > Este mensaje le ha llegado mediante el servicio de correo electronico > que ofrece Infomed para respaldar el cumplimiento de las misiones del > Sistema Nacional de Salud. La persona que envia este correo asume el > compromiso de usar el servicio a tales fines y cumplir con las > regulaciones establecidas > > Infomed: http://www.sld.cu/ > >
De la información del manual(man wget):
-c
--continue
Continue getting a partially-downloaded file. This is
useful when you want to finish up a download started by a
previous instance of Wget, or by another program. For instance:
wget -c ftp://sunsite.doc.ic.ac.uk/ls-lR.Z
If there is a file named ls-lR.Z in the current directory,
Wget will assume that it is the first portion of the remote
file, and will ask the server to continue the retrieval from
an offset equal to the length of the local file.
Note that you don't need to specify this option if you just
want the current invocation of Wget to retry downloading a
file should the connection be lost midway through. This is
the default behavior. -c only affects resumption of
downloads started prior to this invocation of Wget, and
whose local files are still sitting around.
Without -c, the previous example would just download the
remote file to ls-lR.Z.1, leaving the truncated ls-lR.Z file
alone.
Beginning with Wget 1.7, if you use -c on a non-empty file,
and it turns out that the server does not support continued
downloading, Wget will refuse to start the download from
scratch, which would effectively ruin existing contents. If
you really want the download to start from scratch, remove
the file.
Also beginning with Wget 1.7, if you use -c on a file which
is of equal size as the one on the server, Wget will refuse
to download the file and print an explanatory message. The
same happens when the file is smaller on the server than
locally (presumably because it was changed on the server
since your last download attempt)---because "continuing" is
not meaningful, no download occurs.
On the other side of the coin, while using -c, any file
that's bigger on the server than locally will be considered
an incomplete download and only "(length(remote) -
length(local))" bytes will be downloaded and tacked onto the
end of the local file. This behavior can be desirable in
certain cases---for instance, you can use wget -c to
download just the new portion that's been appended to a data
collection or log file.
However, if the file is bigger on the server because it's
been changed, as opposed to just appended to, you'll end up
with a garbled file. Wget has no way of verifying that the
local file is really a valid prefix of the remote file. You
need to be especially careful of this when using -c in
conjunction with -r, since every file will be considered as
an "incomplete download" candidate.
Another instance where you'll get a garbled file if you try
to use -c is if you have a lame HTTP proxy that inserts a
"transfer interrupted" string into the local file. In the
future a "rollback" option may be added to deal with this
case.
Note that -c only works with FTP servers and with HTTP
servers that support the "Range" header.
Saludos,
--
.''`. Tony Palma.
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