rsync: unexpected remote arg

So I was getting a baffling “unexpected remote arg” error from rsync today. Eventually I figured out the problem was that my argument “–executability” had become “– executablility”, I think due to a copy and paste problem where I copied some shell script code from Vim in a Konsole terminal into another Vim in another Konsole terminal. Traps for young players! If you get baffled by this error try putting an ‘echo’ in front of the command and then resize your terminal window to see if that affects things…