+\fB-d\fR, \fB--ignore-dots\fR
+ignore files and directories starting with a dot
+.TP
+\fB-0\fR, \fB--ignore-empty\fR
+ignore empty files
+.TP
+\fB-c\fR, \fB--hide-matchings\fR
+do not show which files from DIR2 corresponds to files from DIR1
+(hence, show only the files from DIR1 which have an identical twin in
+DIR2)
+.TP
+\fB-g\fR, \fB--no-group-ids\fR
+do not show the file group IDs
+.TP
+\fB-p\fR, \fB--show-progress\fR
+show progress information in stderr
+.TP
+\fB-r\fR, \fB--real-paths\fR
+show the real path of the files
+.TP
+\fB-i\fR, \fB--same-inodes-are-different\fR
+files with same inode are considered as different