kerframil 1576947154 learn It is possible to approximate the behaviour of ${var:=default} parameter expansion for array variables. The following code will assign to var, provided that it is either unset or an existing, empty array: [[ ${!var[*]} ]] || var=(my default values)
kerframil 1576949125 forget
kerframil 1576949140 learn It is possible to approximate the behaviour of ${var:=default} parameter expansion for array variables. The following code will assign to var, provided that it is either unset or an existing, empty array: (( ${#var[@]} )) || var=(my default values)