gnu plot with different curves in different intervals ?

[hatsoff]

Hi, all.

I'm interested in plotting the following function:

f(y)=\left\{\begin{array}{ll}y,&0<y<1\\\\2-y,&1\leq y<2\\\\0,&\text{elsewhere}\end{array}\right\}

I know how to plot each curve, but not how to bound them by intervals. Would someone mind taking the time to let me in on the secret?

Thanks!