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Using sed in a for loop

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# 1  
Using sed in a for loop


I have a file called 1.txt, I want to create 2.txt through 100.txt using a for loop. In each instance of the loop, I want to change all "1"'s in the text file to "2"s and so on...

I tried the code below to do this:

for i in {2..100}; do sed 's/1/$i/g' 1.txt > $i.txt; done

but it simply changes the 1's to $i, and not 2 through 100. How can I fix this code? Thanks!
# 2  
Please note that variable expansion happens only inside double quotes not single quotes.
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