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Full Discussion: $(< file ) and $( cat file )
Top Forums Shell Programming and Scripting $(< file ) and $( cat file ) Post 303012386 by jlliagre on Saturday 3rd of February 2018 05:29:50 AM
Old 02-03-2018
Quote:
Originally Posted by ctsgnb
This brings me to the question :
Does the special case $(<filename) support only and strictly 1 file ?
Passing more than one file to the redirection wont be interpreted that way, the second file will just be understood as a command name.
Code:
$(< file1 file2)

Using more than one redirection lead to undefined behavior.
Code:
$(< file1 <file2)

- ksh ignores all redirections but the first one, i.e. output file1. It doesn't check file2 for readability/existence.

- bash silently ignores the whole command, i.e. output nothing, however, it returns an error if file1 or file2 isn't readable (or doesn't exists)
This User Gave Thanks to jlliagre For This Post:
 

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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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