# specifying files
ctags: Notice: No options will be read from files or environment
ctags: Notice: hello
ctags: Notice: world
# specifying a dir
ctags: Notice: No options will be read from files or environment
ctags: Notice: hello
ctags: Notice: world
# reset
ctags: Notice: No options will be read from files or environment
ctags: cannot stat "optlib" : No such file or directory