[Suggestion] change in wget-scripts
thomasp at linuxfromscratch.org
Tue Jan 4 06:44:20 PST 2005
Torsten Vollmann wrote:
> HNY eyeryone.
> Any comments to the following?
> Torsten Vollmann schrieb:
>> Hi all.
>> Right now the wget scripts in the profiles use the -nc option as
>> suggested some months ago by Richard A Downing. The intention is not
>> to download an already existing file a second time.
>> The problem with the -nc option is that it only checks for the
>> existence of the given file. Now there could be the case that the
>> download is interrupted resulting in a partially downloaded file. When
>> the wget script is reinvoked this file wouldn't be completed!
>> So I suggest a change from the '-nc' option to the '-N -r -nd' options:
>> The -N option compares the creation-time and size of the files and
>> starts the download if they differ.
>> The -r option results in the already existing file to be overwritten
>> instead of a .1 file beeing created.
>> In my tests of the -N -r options wget somehow gets to creating the
>> directory-structure of the hosting server so the -nd option must also
>> be given to prevent it from doing that.
>> The benefit of these options is the assurance that the files are
>> completely downloaded, the downside is that for every file in the list
>> wget has to obtain the size and date of the hosted file. This could
>> count in if one has limits in bandwith etc.
Sounds like a good suggestion, will have to do some testing first.
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