good ways of adding/removing multiple directories to/from git repo?

Question

Let's say I have this dir structure:

/project1
  /SomeFolder
  /obj
  /bin
/project2
  /obj
  /bin

Let's say each directory has source files I want to check in, but I don't want to check in /obj and /bin directories or their contents...

The way I did was

git add .

and than browse to each dir and do

git rm obj
git rm bin

As you can imagine this gets tedious especially if there are many directories... What is a better way to do something like that? Namely add multiple files with some exceptions, or remove all subdirectories with certain name?

update

to update multiple directories this will also work:

git rm */obj

Answer 1

You could just add a .gitignore file for each project, right?

According to the docs:

The git add command will not add ignored files by default. If any ignored files were explicitly specified on the command line, git add will fail with a list of ignored files.

Answer 2

You should add these to the .gitignore file in the root of your git project:

echo obj >> .gitignore
echo bin >> .gitignore