كيف يمكن عمل resume لسحب ملف

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كيف يمكن عمل resume لسحب ملف من الانترنت في حال انقطاع الاتصال
هل الامر wget يقوم بذلك ؟

[سيڨيل]

تم نقل الموضوع للقسم المناسب

[KuwaitNET]

wget -c

     -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.

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