nv08

136  wget https://raw.githubusercontent.com/bobdeng/owlreader/master/ERead/assets/books/Harry%20Potter%20and%20the%20Goblet%20of%20Fire.txt
  137  head -n 3 H*.txt
  138  tail H*.txt
  139  clear
  140  grep -o 'Harry' H*.txt | wc -w
  141  grep -o 'Ron' H*.txt | wc -w
  142  grep -o 'Hermione' H*.txt | wc -w
  143  grep -o 'Dumbledore' H*.txt | wc -w
  144  sed -n '100,200p' H*.txt
  145  clear

nv08

 74  mkdir -p hello/five/six/seven
   75  mkdir -p hello/one/two/three/four
   76  cd hello
   77  touch five/six/c.txt
   78  touch five/six/seven/error.log
   79  touch one/a.txt
   80  touch one/b.txt
   81  touch two/d.txt
   82  touch one/two/d.txt
   83  touch one/two/three/e.txt