have some error
1.when you put the wrong command the next right command can not perform
2.when you put the right command the next time can not perform either.
so it has problem!!!
Fixed the execute bugs in the class console.cpp
1.the arguments passed to executed file must have the filename as its begin and NULL as its end
2.the parser.cpp has a bug in the arguments fetching(the edge situation)
Merge branch 'fzj/para-do' into env-path