Write descriptive text from the string into the RCS file, deleting the existing text.
The -t option, in both its forms, has effect only during an initial checkin; it is silently ignored otherwise.
During the initial checkin, if -t is not given, ci obtains the text from standard input, terminated by end-of-file or by a line containing . by itself. The user is prompted for the text if interaction is possible; see -I.
For backward compatibility with older versions of RCS, a bare -t option is ignored.