value]] typeset [
Print or set variables. Options prefaced by + instead of - are inverted in meaning.
Treat the following names as array variables.
Treat the following names as functions.
Expect variable to be an integer, and evaluate its assigned value.
Print names and settings of all shell variables and functions; take no other action.
Do not allow variables to be reset later.
Mark variables for subsequent export.
Print names of all shell functions; take no other action.