file manipulation

Shell Programming and Scripting
1

Hi,

I have a file with 3 lines like

aaaabb
abcdef
wertyu

now i want to insert a new character "Q" in the 3rd position of every line of the file....

I found a way to do it but i felt it is little complex. Do you guys have any ideas

2

just curious - what you've come up with?

3

hmmm

cut -c 1-2 filename.txt > newfile1.txt

cat newfile1.txt | while read line
do
sed '$line/${line}a/g'
done >> newfile.txt

paste newfile1.txt newfile.txt

I know this is crude way of doing it. so any views??

4 
echo 'abcdef' | sed 's/^../&Q/'
5

that is working !! thanks