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Top Forums Web Development www-csli Post 302350930 by pludi on Sunday 6th of September 2009 01:36:24 PM

09-06-2009

Registered User

Short Answer: because they can

Long Answer: because the string 'www' does not identify the service provided. The 'name' of a site is just an alias for the IP of the computer serving the site. All transfer is done using the IP address. In order to find out what IP address belongs to which computer, the DNS network is queried, which maps the URL to an address, and one IP can serve more than one URLs. The identification of which service is used is done by the protocol part of the URL, eg http:// or ftp://, which the client application (eg. the browser) will translate to a certain port (eg. Port 80/TCP). Sites like freshmeat.net even do away with the 'www' part completely.
In larger installations the distinction using the URL is/was done to distinct between server for HTTP (www), FTP (ftp), or E-Mail (smtp/pop).

pludi

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LEARN ABOUT DEBIAN

wdel

wdel(1) 						    Internet Applications - FTP 						   wdel(1)

NAME

       wdel - A wget-like program for deleting files on ftp servers

SYNOPSIS

       wdel [option]... [URL [file]...]...

DESCRIPTION

       Wdel is a free utility that is able to delete files on an ftp server.

       Wdel is non-interactive and background-capable. It can delete files or whole directories and is meant to be a robust client even for unsta-
       ble connections and will therefore retry to delete a file, if the connection broke.

       Wdel supports connections through proxies, allowing you to use it in an environment that can access the internet only via  a  proxy  or	to
       provide	anonymity  by  hiding  your  ip-address to the server.	For SOCKSv5-proxies Wdel supports also listening mode, allowing you to use
       port-mode ftp through a proxy (useful if the remote ftp is behind a firewall or a gateway).

URL-Input-Handling
       URLs are recognized by the ftp://-prefix.

       Wdel first reads the URLs from the command line, and associates every file with the last URL until a new URL is found (note  that  this	is
       different  from	wput).	Then, it reads the --input-file (if any) and parses the URLs in the same way.  So you can specify e.g. one URL and
       read all filenames from a file.

       If there are no explicit filenames given for a singe URL, then the last part of the URL is taken to be the file/directory to be deleted. If
       there are filenames, then the last part of the URL is considered to be the directory where these files reside in. Slashes at the end of the
       URL or the filename (in case it is a directory to be deleted) are ignored.

OPTIONS

       There are no special options introduced by Wdel. All of Wput's options may be supplied, although some will not be  of  any  effect  because
       they do not apply for the process of deleting files. Please see wput(1) for a description of the options.

SEE ALSO

       Many options can be set in a wputrc file. For its documentation consult the sample file provided by Wput.

       wput(1) describes all setable options. Not all apply for wdel too though.

AUTHOR

       Wdel is written by Hagen Fritsch <fritsch+wdel-man@in.tum.de> and Jan Larres <jan@majutsushi.net>

Hagen Fritsch, Jan Larres					       0.6.2								   wdel(1)