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If condition and for loop within sed statement

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# 1  
Old 04-11-2013
If condition and for loop within sed statement
Hi,

I tried to go through a lot of online material but could not find concrete solution.
My issues is like this :

I've got a input file like this :
Code:
<a>
        <startDate>19700101000000</startDate>
        <endDate>20300101000000</endDate>
</a>
        <startDate>19700101000000</startDate>
        <endDate>20300101000000</endDate>
<b>
        <startDate>19700101000000</startDate>
        <endDate>20300101000000</endDate>
</b>
        <startDate>19700101000000</startDate>
        <endDate>20300101000000</endDate>
<c>
        <startDate>19700101000000</startDate>
        <endDate>20300101000000</endDate>
</c>
<d>
        <startDate>19700101000000</startDate>
        <endDate>20300101000000</endDate>
</d>

Now I want to write a single sed command in such a way that I would give $i as input to sed statement to replace date value of ith occurance.
e.g. if i = 2 , then value of 19700101000000 within <stardate></startdate> within <b></b> is changed to 20200101000000. Similarly if i =1, then startdate within a,if i=3 then from within <c> is changed to 20200101000000.
I tried doing :
Code:
sed '/startDate/{s/19700101000000/20200101000000/;};H' "FILENAME.xml"

how to iterate it to loop through a to d and change values as mentioned above.

Please assist.
# 2  
Old 04-11-2013
How does your actual file look like? Does it have a,b,c,d? And why a single sed?

--ahamed
# 3  
Old 04-11-2013
No Actual file does not have tags like a,b,c...
Actual file has <PRE1>,<PRE2>,<PRE3>......
Also here i mean by single sed command is a one liner command. We can append as many -e,-n but want to complete it as a single liner.
# 4  
Old 04-11-2013
Will the elements within the <PREn> tags remain the same? i.e. 2?
Will awk do?

--ahamed
# 5  
Old 04-11-2013
No they will also not remain same. But will definitely contain <startdate> and <enddate> tags.
I know awk would be much easier to do, but can't we do it with sed ?
# 6  
Old 04-11-2013
what do you mean not in sequential order?

--ahamed
# 7  
Old 04-11-2013
Please see my updated reply. :-)
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