280  cat
  281  echo hello >there
  282  cat there 
  283  cat <there
  284  cat <there >here
  285  cat <here
  286  man ls | less
  287  man ls
  288  ls
  295  clear
  296  echo learning shell >>notes
  xxx  echo writing scripts >>notes 
  xxx  cat notes
  297  cat listhome 
  298  less listhome 
  299  ls /homeworks/hw1soln >log
  300  cat log
  301  clear
  302  ls /homeworks/hw1soln 2>log
  303  cat log 
  304  ls
  305  pwd
  308  wc -l <<DONE
  309  Ok this is lecture
  310  this is the second line
  311  third line
  312  DONE
  313  ps aux | less
  317  wget http://courses.cs.washington.edu/courses/cse374/14wi/lectures/mtn.jpg
  319  ls -l mtn.jpg 
  320  man djpeg
  321  man pamscale
  322  man cjpeg
  323  djpeg <mtn.jpg | less
  324  djpeg <mtn.jpg | pamscale -xysize 100 150 | less
  325  djpeg <mtn.jpg | pamscale -xysize 100 150 >mtn.raw
  326  ls -l
  327  djpeg <mtn.jpg | pamscale -xysize 100 150 | cjpeg >thumb.jpg
  328  ls -l
  329  display thumb.jpg 
  xxx  echo hello; echo world
  xxx  ls homeworks
  xxx  ls homeworks || mkdir homeworks
  xxx  ls homeworks
  xxx  ls notes && echo "combine your commands" >notes/tips.txt
  xxx  ls notes/tips.txt
  xxx  mkdir notes && echo "combine your commands" >notes/tips.txt
  xxx  ls notes/tips.txt
  xxx  vim listhome
  xxx  chmod +x listhome
  xxx  ./listhome
  xxx  vim countdown
  xxx  chmod +x countdown
  xxx  ./countdown
  362  history > lec3.history


 Extra:
 direct stderr to stdout, then both go to pipe
 cmd 2>&1 | cmd

 direct both stderr and stdout to same file
 cmd &>file