1  echo ls -l > wombat
    2  source wombat
    3  echo ls -l > dir
    4  source dir
    5  which dir
    6  ls
    7  ls | cat
    8  alias
    9  alias ps="ps aux"
   10  ps
   11  alias
   12  ps
   13  pwd
   14  echo pwd
   15  echo `pwd`
   16  mkdir `pwd`temp
   17  mkdir ./`pwd`temp
   18  mkdir ./`pwd`/temp
   19  ls
   20  echo $?
   21  ls itsnothere
   22  echo $?
   23  cd cse303
   24  ls
   25  cd scripts/
   26  ls -l
   27  tar xfv *
   28  tar xfv lec3scripts.tar 
   29  tar xfv lec4scripts.tar 
   30  ls -l
   31  cat listhome 
   32  pwd
   33  ./listhome 
   34  ls
   35  cat make_thumbnail1
   36  cat make_thumbnail2
   37  ./make_thumbnail2 hello
   38  echo $?
   39  cat countdown 
   40  ./countdown the cat in the hat
   41  ls
   42  cat dcdls 
   43  ./dcdls ~ cse303
   44  cd
   45  xvii=17
   46  echo xvii
   47  echo $xvii
   48  k=3
   49  echo $k
   50  echo ${$k}
   51  history > lec4.history