sh-learn-basic-offset

sh-learn-basic-offset is a variable defined in `sh-script.el'.
Its value is

nil

Documentation:
When `sh-guess-basic-offset' should learn `sh-basic-offset'.

nil mean: never.
t means: only if there seems to be an obvious value.
Anything else means: whenever we have a "good guess" as to the value.

You can customize this variable.