Using Filters
Unix I/O redirection can be used to specify filter source and destination:
Alternatively, most filters allow multiple sources to be specified:
![[prev]](icon/prev.gif){kind=icon}
![[index]](icon/up.gif){kind=icon}
![[next]](icon/next.gif){kind=icon}
![[Diagram:Pic/filter1.png]](Pic/filter1.png)
![[Diagram:Pic/filter2.png]](Pic/filter2.png)