At the end of lecture 1, your instructor typed "history > lecture1-history"
into the shell. She then opened lecture1-history in the emacs editor and
deleted lines corresponding to earlier sessions. Then she wrote this
paragraph, saved the file, and put the result on the website. history is
a special "builtin" for the shell; I encourage you to learn more about it.
  950  ls
  951  unalias ls
  952  ls
  953  ls
  954  ls
  955  ls dirA
  956  ls dirB
  957  ls ..
  958  ls ../isdal
  959  cd dirA
  960  ls
  961  pwd
  962  cd ..
  963  pwd
  964  cd ..
  965  pwd
  966  ls
  967  cd ..
  968  ls
  969  pwd
  970  cd ..
  971  pwd
  972  cd ..
  973  pwd
  974  ls
  975  ls bin
  976  cd bin
  977  ls
  978  ls sed
  979  vi test.txt
  980  cd 
  981  pwd
  982  ls
  983  mkdir cse303
  984  ls
  985  cd cse303/
  986  ls
  987  wget http://www.cs.washington.edu/homes/magda/lecture1.pptx
  988  ls
  989  emacs
  990  vi 
  991  vi test.txt
  992  ls
  993  mv lecture1.pptx lecture1bbbbb.pptx 
  994  man mv
  995  exit