sh-make-vars-local

sh-make-vars-local is a variable defined in `sh-script.el'.
Its value is

t

Documentation:
Controls whether indentation variables are local to the buffer.
If non-nil, indentation variables are made local initially.
If nil, you can later make the variables local by invoking
command `sh-make-vars-local'.
The default is t because I assume that in one Emacs session one is
frequently editing existing scripts with different styles.