How do I delete the newline from a process output?

Question

I call git get the toplevel dir (according to Is there a way to get the git root directory in one command? ).

(let ((tmpbuffer (get-buffer-create (make-temp-         


        

Answer 1

If you only want to remove a newline at the very end of the output, use

(replace-regexp-in-string "\n\\'" "" 
  (shell-command-to-string "git rev-parse --show-toplevel"))

The accepted answer also replaces pairs of newlines ("\n\n") in the output by single newlines ("\n"), because $ matches at the end of the string or after a newline, while \\' only matches at the end of the string.