How to ignore Icon? in git
"Icon[\r]" is probably a better alternative.
In vim, you just put Icon[^M], which is Icon[ followed by CtrlV, Enter then ].
The problem with "Icon\r\r" is EOL conversion.
The whole line is actually "Icon\r\r\n", counting line ending. Based on your setup, CRLF may be converted to LF on commit, so your repo will actually have "Icon\r\n". Say you sync the changes to another repo. You will get "Icon\r\n" in that working directory, which ignores Icon but not Icon^M. If you further edit .gitignore and commit it there, you will end up with "Icon\n" - completely losing \r.
I encountered this in a project where some develop on OS X while some on Windows. By using brackets to separate \r and the line ending, I don't have to repeat \r twice and I don't worry about EOL conversion.
(This improves on the original answer, following a suggestion by robotspacer, according to hidn's explanation.)
The Icon? is the file of OS X folder icon. The "?" is a special character for double carriage return (\r\r).
To tell git to ignore it, open a terminal and navigate to your repository folder. Then type:
printf "Icon\r\r" >> .gitignore
If the file does not exist, it will be created and Icon\r\r will be its one line. If the file does exist, the line Icon\r\r will be appended to it.
You can use vim as well.
vim .gitignore- in a new line write
Icon, then - press ctrl+v and then press Enter
- repeat step 3
- save and exit (shortcut: ZZ)
Now you should have Icon^M^M and it's done :)
For a smarter use you could add it to your gitignore global config file in ~/.gitignore_global.