How to delete a file from git repo?

Question

I have added a file says "file1.txt" to git repo. After that I committed it and add few directories says dir1 and dir2 and committed to git repo. Now the current repo has a file1.txt and dir1 and dir2 . How to delete file1.txt without affecting others like dir1 and dir2.

Answer 1

Use git rm:

git rm file1.txt
git commit -m "remove file1.txt"

Answer 2

More generally, git help will help with at least simple questions like this:

zhasper@berens:/media/Kindle/documents$ git help
usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--html-path] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]

The most commonly used git commands are:
   add        Add file contents to the index
   :
   rm         Remove files from the working tree and from the index