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reference:
-O file
--output-document=file
The documents will not be written to the appropriate files, but all will be concatenated together and
written to file. If - is used as file, documents will be printed to standard output, disabling link
conversion. (Use ./- to print to a file literally named -.)
Use of -O is not intended to mean simply "use the name file instead of the one in the URL;" rather,
it is analogous to shell redirection: wget -O file http://foo is intended to work like wget -O -
http://foo > file; file will be truncated immediately, and all downloaded content will be written
there.
For this reason, -N (for timestamp-checking) is not supported in combination with -O: since file is
always newly created, it will always have a very new timestamp. A warning will be issued if this
combination is used.
Similarly, using -r or -p with -O may not work as you expect: Wget won't just download the first file
to file and then download the rest to their normal names: all downloaded content will be placed in
file. This was disabled in version 1.11, but has been reinstated (with a warning) in 1.11.2, as there
are some cases where this behavior can actually have some use.
Note that a combination with -k is only permitted when downloading a single document, as in that case
it will just convert all relative URIs to external ones; -k makes no sense for multiple URIs when
they're all being downloaded to a single file; -k can be used only when the output is a regular file.
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# To download a single file
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wget http://path.to.the/file
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# To download a file and change its name
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wget http://path.to.the/file -O newname
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# To download a file into a directory
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wget -P path/to/directory http://path.to.the/file
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# To continue an aborted downloaded
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wget -c http://path.to.the/file
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# To download multiples files with multiple URLs
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wget URL1 URL2
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# To parse a file that contains a list of URLs to fetch each one
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wget -i url_list.txt
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# To mirror a whole page locally
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wget -pk http://path.to.the/page.html
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# To mirror a whole site locally
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wget -mk http://site.tl/
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# To download files according to a pattern
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wget http://www.myserver.com/files-{1..15}.tar.bz2
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# To download all the files in a directory with a specific extension if directory indexing is enabled
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wget -r -l1 -A.extension http://myserver.com/directory
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# Allows you to download just the headers of responses (-S --spider) and display them on Stdout (-O -).
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wget -S --spider -O - http://google.com
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# Change the User-Agent to 'User-Agent: toto'
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wget -U 'toto' http://google.com
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