Command is simple, here i provide two samples to show how to copy entire directory in linux.

cp -r sourcedir targetdir

for instance,

1) Copy anything from current directory to /usr/local/download

cp -r * /usr/local/download

2) Copy whole directory (include content) /usr/local/fromdownload to target /usr/local/download

cp -r  /usr/local/fromdownload  /usr/local/download