Unix code wanted to copy template file and replace strings in template file in the copied files

Question

I have 2 files:

File_1.txt:

John
Mary
Harry
Bill

File_2.txt:

My name is ID, and I am on line NR of file 1.

I want to create four files that look like this:

Output_file_1.txt:

My name is John, and I am on line 1 of file 1.

Output_file_2.txt:

My name is Mary, and I am on line 2 of file 1.

Output_file_3.txt:

My name is Harry, and I am on line 3 of file 1.

Output_file_4.txt:

My name is Bill, and I am on line 4 of file 1.

Normally I would use the following sed command to do this:

for q in John Mary Harry Bill
do  
sed 's/ID/'${q}'/g' File_2.txt > Output_file.txt
done

But that would only replace the ID for the name, and not include the line nr of File_1.txt. Unfortunately, my bash skills don't go much further than that... Any tips or suggestions for a command that includes both file 1 and 2? I do need to include file 1, because actually the files are much larger than in this example, but I'm thinking I can figure the rest of the code out if I know how to do it with this hopefully simpler example... Many thanks in advance!

Answer 1

How about:

n=1
while read q
  do  
  sed -e 's/ID/'${q}'/g' -e "s/NR/$n/" File_2.txt > Output_file_${n}.txt
  ((n++))
done < File_1.txt

See the Advanced Bash Scripting Guide on redirecting input to code blocks, and maybe the section on double parentheses for further reading.