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Download using wget is as simple as:

$wget [options] url

[options] has many switches. For example, you can continue from previously broken download with switches ‘-c’. Ex: $wget -c url

If you’re want to download from premium rapidshare account, you can also pass your username and password with switches ‘–http-user=USER’ and ‘–http-password=PASS’.

Here’s some of the switches:

GNU Wget 1.10.2, a non-interactive network retriever.
Usage: wget [OPTION]… [URL]…

Mandatory arguments to long options are mandatory for short options too.

Startup:
-V, –version display the version of Wget and exit.
-h, –help print this help.
-b, –background go to background after startup.
-e, –execute=COMMAND execute a `.wgetrc’-style command.

Logging and input file:
-o, –output-file=FILE log messages to FILE.
-a, –append-output=FILE append messages to FILE.
-d, –debug print lots of debugging information.
-q, –quiet quiet (no output).
-v, –verbose be verbose (this is the default).
-nv, –no-verbose turn off verboseness, without being quiet.
-i, –input-file=FILE download URLs found in FILE.
-F, –force-html treat input file as HTML.
-B, –base=URL prepends URL to relative links in -F -i file.

Download:
-t, –tries=NUMBER set number of retries to NUMBER (0 unlimits).
–retry-connrefused retry even if connection is refused.
-O, –output-document=FILE write documents to FILE.
-nc, –no-clobber skip downloads that would download to
existing files.
-c, –continue resume getting a partially-downloaded file.
–progress=TYPE select progress gauge type.
-N, –timestamping don’t re-retrieve files unless newer than
local.
-S, –server-response print server response.
–spider don’t download anything.
-T, –timeout=SECONDS set all timeout values to SECONDS.
–dns-timeout=SECS set the DNS lookup timeout to SECS.
–connect-timeout=SECS set the connect timeout to SECS.
–read-timeout=SECS set the read timeout to SECS.
-w, –wait=SECONDS wait SECONDS between retrievals.
–waitretry=SECONDS wait 1..SECONDS between retries of a retrieval.
–random-wait wait from 0…2*WAIT secs between retrievals.
-Y, –proxy explicitly turn on proxy.
–no-proxy explicitly turn off proxy.
-Q, –quota=NUMBER set retrieval quota to NUMBER.
–bind-address=ADDRESS bind to ADDRESS (hostname or IP) on local host.
–limit-rate=RATE limit download rate to RATE.
–no-dns-cache disable caching DNS lookups.
–restrict-file-names=OS restrict chars in file names to ones OS allows.
-4, –inet4-only connect only to IPv4 addresses.
-6, –inet6-only connect only to IPv6 addresses.
–prefer-family=FAMILY connect first to addresses of specified family,
one of IPv6, IPv4, or none.
–user=USER set both ftp and http user to USER.
–password=PASS set both ftp and http password to PASS.

Directories:
-nd, –no-directories don’t create directories.
-x, –force-directories force creation of directories.
-nH, –no-host-directories don’t create host directories.
–protocol-directories use protocol name in directories.
-P, –directory-prefix=PREFIX save files to PREFIX/…
–cut-dirs=NUMBER ignore NUMBER remote directory components.

HTTP options:
–http-user=USER set http user to USER.
–http-password=PASS set http password to PASS.
–no-cache disallow server-cached data.
-E, –html-extension save HTML documents with `.html’ extension.
–ignore-length ignore `Content-Length’ header field.
–header=STRING insert STRING among the headers.
–proxy-user=USER set USER as proxy username.
–proxy-password=PASS set PASS as proxy password.
–referer=URL include `Referer: URL’ header in HTTP request.
–save-headers save the HTTP headers to file.
-U, –user-agent=AGENT identify as AGENT instead of Wget/VERSION.
–no-http-keep-alive disable HTTP keep-alive (persistent connections).
–no-cookies don’t use cookies.
–load-cookies=FILE load cookies from FILE before session.
–save-cookies=FILE save cookies to FILE after session.
–keep-session-cookies load and save session (non-permanent) cookies.
–post-data=STRING use the POST method; send STRING as the data.
–post-file=FILE use the POST method; send contents of FILE.

HTTPS (SSL/TLS) options:
–secure-protocol=PR choose secure protocol, one of auto, SSLv2,
SSLv3, and TLSv1.
–no-check-certificate don’t validate the server’s certificate.
–certificate=FILE client certificate file.
–certificate-type=TYPE client certificate type, PEM or DER.
–private-key=FILE private key file.
–private-key-type=TYPE private key type, PEM or DER.
–ca-certificate=FILE file with the bundle of CA’s.
–ca-directory=DIR directory where hash list of CA’s is stored.
–random-file=FILE file with random data for seeding the SSL PRNG.
–egd-file=FILE file naming the EGD socket with random data.

FTP options:
–ftp-user=USER set ftp user to USER.
–ftp-password=PASS set ftp password to PASS.
–no-remove-listing don’t remove `.listing’ files.
–no-glob turn off FTP file name globbing.
–no-passive-ftp disable the “passive” transfer mode.
–retr-symlinks when recursing, get linked-to files (not dir).
–preserve-permissions preserve remote file permissions.

Recursive download:
-r, –recursive specify recursive download.
-l, –level=NUMBER maximum recursion depth (inf or 0 for infinite).
–delete-after delete files locally after downloading them.
-k, –convert-links make links in downloaded HTML point to local files.
-K, –backup-converted before converting file X, back up as X.orig.
-m, –mirror shortcut for -N -r -l inf –no-remove-listing.
-p, –page-requisites get all images, etc. needed to display HTML page.
–strict-comments turn on strict (SGML) handling of HTML comments.

Recursive accept/reject:
-A, –accept=LIST comma-separated list of accepted extensions.
-R, –reject=LIST comma-separated list of rejected extensions.
-D, –domains=LIST comma-separated list of accepted domains.
–exclude-domains=LIST comma-separated list of rejected domains.
–follow-ftp follow FTP links from HTML documents.
–follow-tags=LIST comma-separated list of followed HTML tags.
–ignore-tags=LIST comma-separated list of ignored HTML tags.
-H, –span-hosts go to foreign hosts when recursive.
-L, –relative follow relative links only.
-I, –include-directories=LIST list of allowed directories.
-X, –exclude-directories=LIST list of excluded directories.
-np, –no-parent don’t ascend to the parent directory.