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Full Discussion: While loop Question
Top Forums Shell Programming and Scripting While loop Question Post 302775363 by bakunin on Monday 4th of March 2013 04:47:32 PM
Old 03-04-2013
What happens after you have started the "other process"? Should the script stop then? Start over? Do something entirely different?

Which shell do you use? bash? Korn shell? Something else?

Lacking any specification, here is a Korn shell script, which waits for 10 specified files to be present, then does "something" and exists.

Code:
#! /usr/bin/ksh

typeset    afPattern[1]="/path/to/file1"       # location of files to search for
typeset    afPattern[2]="/path/to/file2"
typeset    afPattern[3]="/path/to/file3"
typeset    afPattern[4]="/path/to/file4"
typeset    afPattern[5]="/path/to/file5"
typeset    afPattern[6]="/path/to/file6"
typeset    afPattern[7]="/path/to/file7"
typeset    afPattern[8]="/path/to/file8"
typeset    afPattern[9]="/path/to/file9"
typeset    afPattern[10]="/path/to/file10"
typeset -i iFound=0                                 # number of found files
typeset -i iCnt=0

while [ $iFound -lt ${#afPattern[*]} ] ; do
     sleep 5
     (( iFound=0 ))
     (( iCnt=1 ))
     while [ $iCnt -le ${#afPattern[*]} ] ; do
          if [ -e "${afPattern[$iCnt]} ] ; then
               (( iFound += 1 ))
          fi
          (( iCnt += 1 ))
     done
done

something
exit 0

The outer loop is left only when all files in the array $afPattern[] are found. in the inner loop these files are checked and the found-counter is increased fo every file found that way. If not all the files are found the loop is restarted (a 5-second delay reduces the taxing of the system - adjust it to your needs), if all files are found the outer loop exits and "something" is executed.

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

net::dns::question

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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