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Top Forums UNIX for Dummies Questions & Answers Device Files names and location Post 302263489 by Carl1976 on Monday 1st of December 2008 05:08:47 PM
Old 12-01-2008
Device Files names and location

HI there. I am studying System administration right now and am stuck on a question that I have failed to find the answer for in my book.

The question is: Do device files need to be in the /dev directory and to they need to follow a naming convention?

My answer (so far) is that since the kernel commnicated with device files, it needs to know where they are located, so I would imagine that yes they do need to be in the /dev directory. And as a rule of thumb there are conventions that need to be followed as "best practices" such as fd, lp etc, but I could make the name whatever I wanted.

I have tried to solve this myself by:
Reading the section in the book again (and again)
Searching other forums and resource sites
played around on my system to test it myself
i.e.
1. cd /home/temp
2. sudo mknod mydev c 136 2
3. echo "testing" > /home/temp/mydev
--> Nothing happens here which would seem to re-enforce my answer that device files do need to be in the /dev dir but ca nstill be named whatever I want

So, this is where I am confused. I have attempted to solve this myself, and don't simply want the answer and that's it, but some help, clarification, point in the right direction etc.

I'm just spinning my wheels so any support would be appreciated. I have emailled my prof as well, and am just waiting as well, so thought I would post the same thing here!
 

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Net::DNS::Question(3pm) 				User Contributed Perl Documentation				   Net::DNS::Question(3pm)

NAME
Net::DNS::Question - DNS question class SYNOPSIS
"use Net::DNS::Question" DESCRIPTION
A "Net::DNS::Question" object represents a record in the question section of a DNS packet. METHODS
new $question = Net::DNS::Question->new("example.com", "MX", "IN"); Creates a question object from the domain, type, and class passed as arguments. RFC4291 and RFC4632 IP address/prefix notation is supported for queries in in-addr.arpa and ip6.arpa subdomains. parse ($question, $offset) = Net::DNS::Question->parse($data, $offset); Parses a question section record at the specified location within a DNS packet. The first argument is a reference to the packet data. The second argument is the offset within the packet where the question record begins. Returns a Net::DNS::Question object and the offset of the next location in the packet. Parsing is aborted if the question object cannot be created (e.g., corrupt or insufficient data). qname, zname print "qname = ", $question->qname, " "; print "zname = ", $question->zname, " "; Returns the domain name. In dynamic update packets, this field is known as "zname" and refers to the zone name. qtype, ztype print "qtype = ", $question->qtype, " "; print "ztype = ", $question->ztype, " "; Returns the record type. In dymamic update packets, this field is known as "ztype" and refers to the zone type (must be SOA). qclass, zclass print "qclass = ", $question->qclass, " "; print "zclass = ", $question->zclass, " "; Returns the record class. In dynamic update packets, this field is known as "zclass" and refers to the zone's class. print $question->print; Prints the question record on the standard output. string print $qr->string, " "; Returns a string representation of the question record. data $qdata = $question->data($packet, $offset); Returns the question record in binary format suitable for inclusion in a DNS packet. Arguments are a "Net::DNS::Packet" object and the offset within that packet's data where the "Net::DNS::Question" record is to be stored. This information is necessary for using compressed domain names. COPYRIGHT
Copyright (c) 1997-2002 Michael Fuhr. Portions Copyright (c) 2002-2004 Chris Reinhardt. Portions Copyright (c) 2003,2006-2009 Dick Franks. All rights reserved. This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Update, Net::DNS::Header, Net::DNS::RR, RFC 1035 Section 4.1.2 perl v5.14.2 2009-12-30 Net::DNS::Question(3pm)
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