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(wget.info)Recursive Retrieval Options
Recursive Retrieval Options
===========================
`-r'
`--recursive'
Turn on recursive retrieving. Note: Recursive Retrieval, for
more details.
`-l DEPTH'
`--level=DEPTH'
Specify recursion maximum depth level DEPTH (Note: Recursive
Retrieval). The default maximum depth is 5.
`--delete-after'
This option tells Wget to delete every single file it downloads,
_after_ having done so. It is useful for pre-fetching popular
pages through a proxy, e.g.:
wget -r -nd --delete-after http://whatever.com/~popular/page/
The `-r' option is to retrieve recursively, and `-nd' to not
create directories.
Note that `--delete-after' deletes files on the local machine. It
does not issue the `DELE' command to remote FTP sites, for
instance. Also note that when `--delete-after' is specified,
`--convert-links' is ignored, so `.orig' files are simply not
created in the first place.
`-k'
`--convert-links'
After the download is complete, convert the links in the document
to make them suitable for local viewing. This affects not only
the visible hyperlinks, but any part of the document that links to
external content, such as embedded images, links to style sheets,
hyperlinks to non-HTML content, etc.
Each link will be changed in one of the two ways:
* The links to files that have been downloaded by Wget will be
changed to refer to the file they point to as a relative link.
Example: if the downloaded file `/foo/doc.html' links to
`/bar/img.gif', also downloaded, then the link in `doc.html'
will be modified to point to `../bar/img.gif'. This kind of
transformation works reliably for arbitrary combinations of
directories.
* The links to files that have not been downloaded by Wget will
be changed to include host name and absolute path of the
location they point to.
Example: if the downloaded file `/foo/doc.html' links to
`/bar/img.gif' (or to `../bar/img.gif'), then the link in
`doc.html' will be modified to point to
`http://HOSTNAME/bar/img.gif'.
Because of this, local browsing works reliably: if a linked file
was downloaded, the link will refer to its local name; if it was
not downloaded, the link will refer to its full Internet address
rather than presenting a broken link. The fact that the former
links are converted to relative links ensures that you can move
the downloaded hierarchy to another directory.
Note that only at the end of the download can Wget know which
links have been downloaded. Because of that, the work done by
`-k' will be performed at the end of all the downloads.
`-K'
`--backup-converted'
When converting a file, back up the original version with a `.orig'
suffix. Affects the behavior of `-N' (Note: HTTP Time-Stamping
Internals).
`-m'
`--mirror'
Turn on options suitable for mirroring. This option turns on
recursion and time-stamping, sets infinite recursion depth and
keeps FTP directory listings. It is currently equivalent to `-r
-N -l inf -nr'.
`-p'
`--page-requisites'
This option causes Wget to download all the files that are
necessary to properly display a given HTML page. This includes
such things as inlined images, sounds, and referenced stylesheets.
Ordinarily, when downloading a single HTML page, any requisite
documents that may be needed to display it properly are not
downloaded. Using `-r' together with `-l' can help, but since
Wget does not ordinarily distinguish between external and inlined
documents, one is generally left with "leaf documents" that are
missing their requisites.
For instance, say document `1.html' contains an `<IMG>' tag
referencing `1.gif' and an `<A>' tag pointing to external document
`2.html'. Say that `2.html' is similar but that its image is
`2.gif' and it links to `3.html'. Say this continues up to some
arbitrarily high number.
If one executes the command:
wget -r -l 2 http://SITE/1.html
then `1.html', `1.gif', `2.html', `2.gif', and `3.html' will be
downloaded. As you can see, `3.html' is without its requisite
`3.gif' because Wget is simply counting the number of hops (up to
2) away from `1.html' in order to determine where to stop the
recursion. However, with this command:
wget -r -l 2 -p http://SITE/1.html
all the above files _and_ `3.html''s requisite `3.gif' will be
downloaded. Similarly,
wget -r -l 1 -p http://SITE/1.html
will cause `1.html', `1.gif', `2.html', and `2.gif' to be
downloaded. One might think that:
wget -r -l 0 -p http://SITE/1.html
would download just `1.html' and `1.gif', but unfortunately this
is not the case, because `-l 0' is equivalent to `-l inf'--that
is, infinite recursion. To download a single HTML page (or a
handful of them, all specified on the commandline or in a `-i' URL
input file) and its (or their) requisites, simply leave off `-r'
and `-l':
wget -p http://SITE/1.html
Note that Wget will behave as if `-r' had been specified, but only
that single page and its requisites will be downloaded. Links
from that page to external documents will not be followed.
Actually, to download a single page and all its requisites (even
if they exist on separate websites), and make sure the lot
displays properly locally, this author likes to use a few options
in addition to `-p':
wget -E -H -k -K -p http://SITE/DOCUMENT
To finish off this topic, it's worth knowing that Wget's idea of an
external document link is any URL specified in an `<A>' tag, an
`<AREA>' tag, or a `<LINK>' tag other than `<LINK
REL="stylesheet">'.
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