-I parameter of the SED command in Mac

Today, I used the Mac to replace several texts with SED and replaced them with the-I parameter. Tangled up.

Man SED

Discovery-I requires a string to back up the source file. This string is added after the source file name to form the backup file name.

If the length of this string is 0, that is, it is an empty string, it is not backed up.

Haha, it's really interesting.

Sed-I "BS"'s/ATL/dog/G' example.txt

This will generate a backup file example.txt BS.

If no backup is available, leave it blank.

Sed-I ""'s/ATL/dog/G' example.txt

However, it cannot be omitted. Haha...