permission denied when sed in place edit in mingw

Question

I'm using mingw.

  $ sed -i "s/a/b/" test.txt   sed: preserving permissions for `./sed003480': Permission denied 

I can touch/rm files in current dir.

Answer 1

It's caused by Windows security settings.

Open the folder's Properties settings from the context menu. In the Security tab, click Edit, press Add... in the pop-up window and add your user to the list, check Full Control in the Allow column. Press OK twice to apply the changes.

Answer 2

For me, folder was read only. unchecking readonly option fix my problem. Thanks to Zenadix commment