use curl to resume a failed download

cat file-that-failed-to-download.zip | curl -C - http://www.somewhere.com/file-I-want-to-download.zip >successfully-downloaded.zip
If you are downloading a big file (or even a small one) and the connection breaks or times out, use this command in order to RESUME the download where it failed, instead of having to start downloading from the beginning. This is a real win for downloading debian ISO images over a buggy DSL modem. Take the partially downloaded file and cat it into the STDIN of curl, as shown. Then use the "-C -" option followed by the URL of the file you were originally downloading.
Sample Output
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 17.1M  100 17.1M    0     0   746k      0  0:00:23  0:00:23 --:--:--  793k

-1
2009-08-05 13:33:06

1 Alternatives + Submit Alt

What Others Think

Using wget looks simpler: wget -c http://www.somewhere.com/file-I-want-to-download.zip -O file-that-failed-to-download.zip
Decoy · 791 weeks and 4 days ago
Decoy is correct. We usually use "wget -c ..." after cd to the dir where the file resides.
totti · 688 weeks and 2 days ago
why to use the cat command? I mean: the simplest way to accomplish this task would be doing something like: curl -C - -L -O http://www.somewhere.com/file-I-want-to-download.zip Of course, the above command should be entered in the same directory where the file-I-want-to-download.zip is. Agree or not agree?
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