10.19

1. recite the ひらかな　＆＆　かたかな　
2. edx: introduction to linux. CHAPTER 6 : learn how to use man/info/gnome-help. "man -k = whatis" "man -f "
3. Hard and Soft Links : ln file1 file2 (hard) /  ln -s file1 file2 (soft);