EXE=swap                          # name of the file
rm $EXE                           # remove the executable
g++ -O -o $EXE $EXE.cc            # compile source
./$EXE <$EXE.in >$EXE.out         # run executable, redirect output
cat $EXE.out                      # display output
# less $EXE.out                 # uncomment for long output