Bash for loop with wildcards and hidden files

The default globbing in bash does not include filenames starting with a . (aka hidden files).

You can change that with

shopt -s dotglob

$ ls -a
.  ..  .a  .b  .c  d  e  f
$ ls *
d  e  f
$ shopt -s dotglob
$ ls *
.a  .b  .c  d  e  f
$ 

To disable it again, run shopt -u dotglob.