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Did you try Chubler_XL's code snippet?

for i in 1 2
do
sed -i "s:filename:~/Downloads/Project/${i}.tcl:g" ~/Downloads/Project/p0s5n15_$i.tcl;
done

Try this:
for i in 1 2
do
sed -i "s/hello/hello${i}/g" ~/Downloads/Project/file$i.tcl
done

it works for me !

Please give space between file name and quote ie '

sed -i 's/^$ns_/$ns/g' ~/Downloads/Project/p0s5n15_$i.tcl

something like this:

1.
sed -i 's/God/GOD/g' file*

2.
#!/bin/bash
for (( i=1; i<=4; i++ ))
do
echo hello"$i" > "file""$i"
done

like this:
sed -i 's/^Hello1/hi/g' File1

What about


for i in 1 2 3

?