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Full Discussion: How to get the modified value of variable outside the while loop reading from a file
Top Forums Shell Programming and Scripting How to get the modified value of variable outside the while loop reading from a file Post 302335635 by kshji on Monday 20th of July 2009 06:14:14 AM
Old 07-20-2009
count= `expr $count + $i`
=>
count=`expr $count + $i`

Setting variable must the whole set to be in 1st argument.

Which shell you are using ?
If you have not old bsh, then you can write without using external expr.
Always add the correct shell to the 1st line in script, no need to take care of your interactive "keyboard" shell and for us it's easier to give solution.
Code:
#!/bin/ksh
count=0
i=0
while read line
do
     (( i=i+1 ))    # or  (( i+=1 ))
     (( count = count + i ))
done < input.txt

echo " i Value =$i "
echo " Count Value = $count"

 

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LEARN ABOUT DEBIAN

ldns-dpa

dpa(1)							      General Commands Manual							    dpa(1)

NAME

       dpa - DNS Packet Analyzer. Analyze DNS packets in ip trace files

SYNOPSIS

       dpa [ OPTION ] TRACEFILE

DESCRIPTION

       dpa  is	used  to  analyze  dns	packets  in trace files. It has 3 main options: count, filter, and count uniques (i.e. count all different
       occurences).

OPTIONS

       -c expressionlist
	      Count occurrences of matching expressions

       -f expression
	      Filter: only process packets that match the expression

       -h     Show usage

       -p     Show the total number of correct DNS packets, and percentage of -u and -c values	(of the total of matching on the -f filter. if	no
	      filter is given, percentages are on all correct dns packets)

       -of file
	      Write all packets that match the -f flag to file, as pcap data.

       -ofh file
	      Write all packets that match the -f flag to file, in hexadecimal format, readable by drill.

       -s     Show possible match names

       -s matchname
	      show possible match operators and values for name

       -sf    Only evaluate packets (in representation format) that match the -f filter.  If no -f was given, evaluate all correct dns packets.

       -u matchnamelist
	      Count every occurence of every value of the matchname (for instance, count all packetsizes, see EXAMPLES in ldns-dpa(1) ).

       -ua    For  every  matchname  in  -u, show the average value of all matches. Behaviour for match types that do not have an integer value is
	      undefined.

       -uac   For every matchname in -u, show the average number of times this value was encountered.

       -um number
	      Only show the results from -u for values that occurred more than <number> times.

       -v level
	      Set verbosity to level (1-5, 5 being the highest). Mostly used for debugging.

       -notip file
	      Write packets that were not recognized as IP packets to file (as pcap data).

       -baddns file
	      Write dns packets that were too mangled to parse to file (as pcap data).

       -version
	      Show version and exit

LIST AND MATCHES

       A <matchnamelist> is a comma separated list of match names (use -s to see possible match names).  A <expressionlist> is a  comma  separated
       list of expressions.

       An expression has the following form: <expr>: (<expr>)
	       <expr> | <expr>
	       <expr> & <expr>
	       <match>

       <match>:        <matchname> <operator> <value>

       <operator>:	 =    equal  to  <value>       !=   not  equal	to  <value>	  >    greater	than <value>	  <    lesser than <value>
	    >=	 greater than or equal to <value>      <=   lesser than or equal to <value>	 ~=   contains <value>

       See the -s option for possible matchnames, operators and values.

EXAMPLES

       ldns-dpa -u packetsize -p test.tr
	      Count all different packetsizes in test.tr and show the precentages.

       ldns-dpa -f "edns=1&qr=0" -of edns.tr test.tr
	      Filter out all edns enable queries in test.tr and put them in edns.tr

       ldns-dpa -f edns=1 -c tc=1 -u rcode test.tr
	      For all edns packets, count the number of truncated packets and all their rcodes in test.tr.

       ldns-dpa -c tc=1,qr=0,qr=1,opcode=QUERY test.tr
	      For all packets, count the number of truncated packets, the number of packets with qr=0, the number of packets  with  qr=1  and  the
	      number of queries in test.tr.

       ldns-dpa -u packetsize -ua test.tr
	      Show all packet sizes and the average packet size per packet.

       ldns-dpa -u srcaddress -uac test.tr
	      Show all packet source addresses and the average number of packets sent from this address.

       sudo tcpdump -i eth0 -s 0 -U -w - port 53 | ldns-dpa -f qr=0 -sf
	      Print all query packets seen on the specified interface.

AUTHOR

       Written by Jelte Jansen for NLnetLabs.

REPORTING BUGS

       Report bugs to <jelte@nlnetlabs.nl>.

COPYRIGHT

       Copyright  (C)  2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
       POSE.

								    1 Nov 2005								    dpa(1)
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