rcs: Description option

 
 2.1.3 Description option
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 Some commands accept an option of the form ‘-t-TEXT’ or ‘-tFILE-NAME’.
 This option is to set or update the RCS file description text.  In the
 first form, TEXT is used directly, excluding the leading hyphen (‘-’)
 that distinguishes the two forms.  In the second form, the description
 text is taken from the contents of FILE-NAME.