Sed: (only for fedora18)

Sed encountered the unknowncommand: (only for fedora18) problem the past two days to learn sed, according to the example of the exercises, but found some problems, do not know is not my fedora18 system problems. Enter: echoyouareright | sed \'s/right/wrong /... sed has the unknown command (only for fedora18) problem. I learned sed over the past two days and practiced it according to your examples. but I found some problems. I don't know if it is my fedora18 system problem. Enter echo you are right | sed \'s/right/wrong/\ '------------------------------ in the terminal and press enter to report the following error: sed:-e expression #1, char 1: unknown command: ''' the above sed command demonstrates how to easily change "right" to "wrong", but an error is returned. The correct information should be: enter echo you are right | sed's/right/wrong/'------------------------------ on the terminal to display: you are wrong note: the escape character "\" cannot appear in the sed command that replaces the string "\"