install and run the dart command line REPL

gistfile1.sh

#!/bin/sh

# move to the dart/frog folder in your checkout
cd ~/workspace/dartlang/dev/dart/frog

# build the VM
../tools/build.py -m release

# build frogsh
./frog.py --out=frogsh --compile-only --enable_type_checks frog.dart

#run the REPL
out/Release_ia32/frog/bin/frogsh samples/ifrog.dart 

# you should see a '>>>' prompt
# enter dart code
# terminate with CTRL-C