02  mkdir cse374
  03  cd cse374;ls -l
  04  echo "hello" >hello
  05  echo "it's Friday" > weekend
  06  ls -l
  07  cat weekend 
  08  cat *
  09  echo *
  10  ls -l
  11  cat >lscmd
  12  cat lscmd 
  13  ls -l
  14  source lscmd 
  15  cat lscmd 
  16  ls -l
  17  cat hello
  18  source hello
  19  emacs &
  20  ls -l
  21  cat weekend
  22  source lscmd
  23  ls -l
  24  mv weekend weekend.txt
  25  cat weekend.txt 
  26  emacs weekend.txt &
  27  ls 
  28  dir
  29  alias
  30  which dir
  31  listfiles
  32  alias listfiles=ls
  33  listfiles
  34  alias listfiles=ls -l
  35  alias listfiles="ls -l"
  36  listfiles
  37  man ls
  38  man yes
  39  yes
  40  man no
  41  man yes
  42  man less
  43  pwd
  44  cd
  45  ls -l
  46  cd 03-scripts1-files/
  47  ls -l
  48  cat </etc/passwd
  49  cat </etc/passwd | less
  50  ls -l
  51  wc countdown 
  52  cat <etc/passwd |wc
  53  cat </etc/passwd |wc
  54  ls /usr/share/dict/
  55  less /usr/share/dict/words
  56  cat /usr/share/dict/words 
  57  cat /usr/share/dict/words |wc
  58  ls -l
  59  display mtn.jpg 
  60  djpeg mtn.jpg 
  63  cd 03-scripts1-files/
  64  ls -l
  65  djpeg mtn.jpg | wc
  66  man pnmscale
  67  djpeg mtn.jpg | wc
  68  djpeg mtn.jpg | pnmscale -xysize 100 150 | wc
  69  djpeg mtn.jpg | pnmscale -xysize 100 150 >thumb.jpg
  70  ls -l
  71  display thumb.jpg 
  72  cd
  73  history >lec3.history