ref: 6a09d2da7e29f18a244f3a3a2959d0a78ed9540b
dir: /sys/src/cmd/python/Demo/pdist/mac.py/
import sys
import string
import rcvs
def main():
    while 1:
        try:
            line = raw_input('$ ')
        except EOFError:
            break
        words = string.split(line)
        if not words:
            continue
        if words[0] != 'rcvs':
            words.insert(0, 'rcvs')
        sys.argv = words
        rcvs.main()
main()