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Top Forums Shell Programming and Scripting if statement with two conditions -e, && Post 74925 by vgersh99 on Tuesday 14th of June 2005 11:50:44 AM
Old 06-14-2005
Quote:
Originally Posted by yongho
Question: I just started learning shell scripting a few days ago and I was under the assumption that you didn't need to typeset anything.
you don't.
if you don't,

count=$((count + 1))
becomes
count=$(($count + 1))

Quote:
Originally Posted by yongho
One of my previous counters looked like this (in a while statement, not an if statement:
var1=`expr $var1 + $var2`
..and it worked.
this NOT using ksh/bash builtin capabilities for doing simple integer math.
Quote:
Originally Posted by yongho
But when I tried the expr command in the if statement, it didn't increment at all. Would you know why this is? Could it be because once you enter an if statement, you must use different rules?
nope, that's not it.
are you saying that the 'expr ' increment did not work, but the 'count=$((count+1))' did?
there must be something else different in your 'while' loop.
is your 'while' loopbeing piped with data?
 

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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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