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Top Forums UNIX for Dummies Questions & Answers A question about Unix Architecture. Post 302688007 by Corona688 on Friday 17th of August 2012 11:09:02 AM
Old 08-17-2012
You're asking like UNIX is a kind of computer; it isn't.

UNIX can run on many kinds of processors and memories, on scales from embedded microcomputer(things like wireless routers) all the way up to distributed clusters and supercomputers.

There's also many kinds of kernels of several kinds you mention; there's real-tasking UNIXes(QNX), monolithic(Linux, though that's technically UNIX-like), and more.

How is this possible?

Easy -- they're not all the same thing. UNIX is a design plan, not an operating system. As long as your OS is certified as providing the right set of features, it can be considered a UNIX, no matter how it's built internally. Lots of different individuals and software companies have built a UNIX to their own design or need.

So, it's very difficult to be anything but vague about "what is UNIX" with respect to those particular questions. You need to be more specific about which UNIX.
 

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micro-httpd(8)							   User Commands						    micro-httpd(8)

NAME
micro-httpd - really small HTTP server SYNOPSIS
micro-httpd DIRECTORY OPTIONS
None. DESCRIPTION
micro-httpd is a very small HTTP server all in 150 lines of code. It runs from inetd, which means its performance is poor. But for low- traffic sites, it is quite adequate. It implements all the basic features of an HTTP server, including: * Security against ".." filename snooping. * The common MIME types. * Trailing-slash redirection. * index.html * Directory listings. To install it, add a line like this to /etc/inetd.conf: micro-http stream tcp nowait nobody /usr/sbin/micro-httpd micro-httpd dir Make sure the path to the executable is correct, and change "dir" to be the directory you want to serve. You could add line like this to /etc/services: micro-http port/tcp #Micro HTTP server Change "port" to the port number you want to use: 80, 8000, whatever. Restart inetd by sending it a "HUP" signal. On some systems, inetd has a maximum spawn rate - if you try to run inetd services faster than a certain number of times per minute, it assumed there is either a bug of an attack going on and it shuts down for a few minutes. If you run into this problem - look for syslog messages about too-rapid looping - you will need to find out how to increase the limit. Unfortunately this varies from OS to OS. On FreeBSD, you add a "-R 10000" flag to inetd's initial command line. On some Linux systems, you can set the limit on a per-service basis in inetd.conf, by changing "nowait" to "nowait.10000". Note that you can use micro-httpd to serve HTTPS, if you like, by running it from stunnel. First fetch and install stunnel - FreeBSD users can just go to /usr/ports/security/stunnel and do a "make cert ; make install". Then as root run: stunnel -p /usr/local/certs/stunnel.pem -d 443 -l /usr/sbin/micro-httpd -- micro-httpd dir Make sure the paths to the certificate and executable are correct, and again don not forget to change "dir" to the directory you want to serve. ENVIRONMENT
None. FILES
None. SEE ALSO
inetd(8) micro-inetd(8) xinetd(8) AUTHORS
Copyright (C) 1999 Jef Poskanzer <jef@mail.acme.com>. All rights reserved. This manual page was updated by Jari Aalto <jari.aalto@cante.net>. Released under license GNU GPL v2 or (at your option) any later version. For more information about license, visit <http://www.gnu.org/copyleft/gpl.html>. micro-httpd 2012-04-03 micro-httpd(8)
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