501  cd humboldt/f12cs279/279lectures/279lect13-2/
  502  myNum=4
  503  let myNum+=1
  504  echo $myNum
  505  expr \( 3 + 4 \) \* 8
  506  expr '( 3 + 4 ) * 8'
  507  expr 3 \| 4
  508  expr 0 \| 4
  509  expr 0 \| 0
  510  expr "" \| 3
  511  expr 3 \& 4
  512  expr 3 \& ""
  513  expr 134 : 3
  514  expr 134 \: 3
  515  expr oink \: "[a-z]"
  516  expr oink \: "[a-z][a-z]"
  517  bc
  518  bc
  519  echo "3*4" | bc
  520  myProduct=`echo "3*4" | bc`
  521  echo myProduct
  522  echo $myProduct
  523  alpha=2
  524  beta=4
  525  my_sum=$alpha + $beta
  526  my_sum=alpha+beta
  527  echo $mySum
  528  echo $my_sum
  529  my_sum=`expr $alpha + $beta`
  530  echo $my_sum
  531  my_sum=0
  532  my_sum="expr $alpha + $beta"
  533  echo $my_sum
  534  sleep 5
  535  emacs beeper.sh
  536  beeper.sh
  537  fg
  538  beeper.sh 5
  539  time beeper.sh 5 > looky-beep
  540  man time
  541  time -p beeper.sh 5 > looky-beep
  542  time -l beeper.sh 5 > looky-beep
  543  time beeper.sh 5 
  544  emacs callbeep.sh
  545  beeper.sh 60 > looky &
  546  wait 4604 ; echo "hi"
  547  beeper.sh 5
  548  ps g
  549  ps g
  550  ps g
  551  ps g
  552  more looky
  553  ps g
  554  ps g
  555  more looky2
  556  ps g
  557  ls
  558  more looky2
  559  ps g
  560  ps x
  561  ps x | grep beep
  562  ps x | grep beep
  563  ps x | grep beep
  564  jobs
  565  ps x | grep beep
  566  more looky2
  567  nice -n 19 beeper.sh 30 > looky3 & 
  568  ps x
  569  ps x | grep beep
  570  ps x | grep beep
  571  beeper.sh 60 > looky3 & 
  572  ps x | grep beep
  573  renice -n 5 -p 4893
  574  ps x | grep beep