Equivalent of 'watch' command for OS X

'watch' doesn't exist inbuilt for OS X like it does for linux. Someone has actually implemented it and it is available from fink, but here is a bash function that uses a simple while loop to do basically the same thing. Drop this into bash_aliases and you now have a simple version of watch.

watch () {
  while [ 1 ]; do "${@}" ; sleep 2 ; done
}