06-23-2013
The question can easily be answered with a 5-second google search for "AIX rhdisk hdisk". I suggest you read the first hit coming up on this search:
IBMs documentation.
Even without searching for anything your directory listing shows one to be a character-device and the other to be a block device.
For the future i suggest using google first and us second.
I hope this helps.
bakunin
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DWWW(1) Debian DWWW(1)
NAME
dwww - access documentation via WWW
SYNOPSIS
http://localhost/dwww/index.html
dwww
dwww program-name | package-name
DESCRIPTION
A typical Linux system has documentation in many formats (manual pages, info files, READMEs, and so on). dwww makes it possible to access
all of these via the same interface, a WWW browser. This makes it easier to use the documentation.
To use dwww, load the URL given in the SYNOPSIS. If you have a web browser installed, you can also just run the dwww command which loads
the URL. If BROWSER environment variable is set, dwww uses sensible-browser(1) to load the URL. Otherwise, dwww first tries to use
browser specified by DWWW_BROWSER or DWWW_X11_BROWSER configuration variable (cf. dwww(7)), than will use sensible-browser(1) command.
If optional argument program-name or package-name is specified, dwww will search all documentation related to given program or package.
ENVIRONMENT
BROWSER
Program used to load the above mentioned URL.
FILES
/etc/dwww/dwww.conf
Configuration file for dwww.
SEE ALSO
dwww-find(8), dwww(7), sensible-browser(1).
AUTHOR
Lars Wirzenius <liw@iki.fi>. Modified by Robert Luberda <robert@debian.org>.
Bugs should be reported via the Debian Bug Tracking System at <URL:http://bugs.debian.org/>.
dwww is licensed via the GNU General Public License. While it has been written for Debian, porting it to other systems is strongly encour-
aged.
dwww 1.11.1 February 15th, 2009 DWWW(1)