关于sleep的问题

jshwin

今天逛论坛的时候看到有人写了如下代码：

sleep .4

不解，求解释

laliheyi

回复 1# jshwin


    floating point number

elu_ligao

就是sleep 0.4s吧
      Pause for NUMBER seconds.  SUFFIX may be ‘s’ for seconds (the default), ‘m’ for minutes, ‘h’ for hours or ‘d’ for days.  Unlike most implementa-
       tions that require NUMBER be an integer, here NUMBER may be an arbitrary floating point number.

bikong0411

sleep 0.4 ； shell里面0.x可以省了0