This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
all flag variables initialized with zero
respond `Y' is equal to `y'
update usage string
prompt only if source exist
ignore -i option if file descriptor stdin not refers to a valid
terminal type device
