如何使用sed遍历文件并将输出保存在不同的文件中？

Question

I have two different files A.txt and B.txt both containing the same string. I would like to use a sed command in order to replace the strings but I do not want to overwrite A.txt and B.txt.

Actually I would like to loop over files and then do something like this for both :

sed 's/myString/myNewString/g' A.txt > updatedA.txt

What trick can I use in order to redirect outputs this way for as many files as I want ? Let's assume I've got x *.txt files.

Thanks.

Answer 1

With a for loop for all .txt files in current directory:

for file in *.txt; do
  sed 's/myString/myNewString/g' "$file" > "updated$file"
done

Use this script only once per directory.

Answer 2

This might work for you (GNU parallel):

parallel sed 's/myString/myNewString/g' {} \> updated{} ::: *.txt

This will loop through all txt files in the current directory and make amendments/copies to new files prefixed by updated .

If you only want create files for those with changes, use:

parallel grep myString {} \&\& sed 's/myString/myNewString/g' {} \> updated{} ::: *.txt

Or re-curse through all txt files in a directory, use:

find . -name '*.txt' | parallel sed 's/myString/myNewString/g' {} \> {//}/updated{/}