K 10
svn:author
V 5
wosch
K 8
svn:date
V 27
1996-02-18T18:44:58.000000Z
K 7
svn:log
V 234
option -f and -i are exclusive
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

END