Not able to install xkcd fonts

Question

I was trying the xkcd font as per the instructions given in the vignette: vignette(\"xkcd-intro\")

However get an error on the following step:

Answer 1

1. Are you sure it's not supposed to be xkcd.ttf instead of xkcd.tff?

2. I'm fairly certain that cp SOURCE OPTION DESTINATION is not a legal use of cp on any Unix system. In fact, since you're copying only one file, you don't even need the -t option. It should probably just be system("cp xkcd.ttf ~/.fonts/").