506  test -e pig.txt && echo 'you have that file'
  507  echo oink > pig.txt
  508  test -e pig.txt && echo 'you have that file'
  509  test -e pig.txt
  510  test ! -e pig.txt && echo 'file does not exist'
  511  test ! -e pog.txt && echo 'file does not exist'
  512  exit-ex.sh pog.txt
  513  exit-ex.sh pig.txt
  514  filename="My stuff.txt"
  515  echo $filename
  516  test $filename = "foo"
  517  test "$filename" = "foo"
  518  for-quotes.sh "moo baa la"
  519  chmod 700 more-than-5.sh 
  520  more-than-5.sh 
  521  more-than-5.sh 1 2 3 4 5
  522  more-than-5.sh 1 2 3 4 5 6
  523  echo $filename
  524  [[ $filename =~ tuff ]] && echo "matched"
  525  [[ $filename =~ "tuff" ]] && echo "matched"
  526  [[ $filename =~ t*uff ]] && echo "matched"
  527  [[ $filename =~ "t*uff" ]] && echo "matched"
  528  [[ "$filename" =~ t*uff ]] && echo "matched"
  529  glob-play.sh
  530  glob-play.sh
  531  glob-play.sh
  532  read-lines-ex.sh 
  533  history > 279lab08-history.txt