create 12 month binned averages using shell script

I want to create a 12 month binned or rolling average to help smooth the data. I currently have monthly averages in the file. Since a 12 month rolling average needs 12 months of course, the first 11 rows will not have a binned average. I would prefer to create a separate output file with a 3 column for the binned average next to the corresponding YYYYMM. I could then create a graph showing the monthly data alongside the smoothed binned average.
avgs.txt
libertyforall2Asked:
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n4th4nr1chCommented:
>moving-avgs.txt
while read line
	do
		read date average < <(echo $line)
		qty[$i]=$average
		[[ i -ge 11 ]] && {
			addlist=$(echo ${qty[@]:$((i-11)):$i} | sed 's/ /+/g')
			avg=$(echo "scale=2;($addlist)/12" | bc)
			echo $date $average $avg >> moving-avgs.txt
		}
		((i++))
	done < avgs.txt

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libertyforall2Author Commented:
<code>
#!/bin/ksh

>moving-avgs.txt
while read line
      do
            read date average < <(echo $line)
            qty[$i]=$average
            [[ i -ge 11 ]] && {
                  addlist=$(echo ${qty[@]:$((i-11)):$i} | sed 's/ /+/g')
                  avg=$(echo "scale=2;($addlist)/12" | bc)
                  echo $date $average $avg >> /home/uila3/rhuff/msstate/moving-avgs.txt
            }
            ((i++))
      done < /home/uila3/rhuff/msstate/avgs.txt
</code>


uila% sh maverages.sh > /home/uila3/rhuff/msstate/mavgs.txt
maverages.sh: line 6: syntax error near unexpected token `<'
maverages.sh: line 6: `            read date average < <(echo $line)'
uila%
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n4th4nr1chCommented:
Shell scripting most commonly means BASH or SH.
you are using ksh.
Change your shebang to #!/bin/bash
Or run the program by specifying bash scriptname.bash
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libertyforall2Author Commented:
I removed the shebang I get this message

maverages.sh: line 6: `            read date average < <(echo $line)'
uila%
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n4th4nr1chCommented:
bash scriptname

if you still get an error pastebin the output from these for me:
bash --version
bash -x scriptname
uname -a
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libertyforall2Author Commented:
Ok. It worked but I wanted to keep the first 11 rows with only 2 columns instead of deleting them. it would be 3 columns from row 12 and after.
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n4th4nr1chCommented:
>moving-avgs.txt
while read line
	do
		read date average < <(echo $line)
		qty[$i]=$average
		[[ i -ge 11 ]] && {
			addlist=$(echo ${qty[@]:$((i-11)):$i} | sed 's/ /+/g')
			avg=$(echo "scale=2;($addlist)/12" | bc)
			echo $date $average $avg >> moving-avgs.txt
		}||{
			echo $date $average >> moving-avgs.txt
		}
		((i++))
	done < avgs.txt

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libertyforall2Author Commented:
Works. Thanks.
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Shell Scripting

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