To make this thread more complete, here is the final version.
```
import std.stdio;
import std.process;
version (Windows) { enum Find = "find"; }
version (Posix) { enum Find = "grep"; }
int main (string [] args)
{
auto p1 = pipe;
auto p2 = pipe;
auto pid1 = spawnShell("echo HelloWorld", stdin, p1.writeEnd);
auto pid2 = spawnShell(Find ~ " \"HelloWorld\"", p1.readEnd,
p2.writeEnd);
auto pid3 = spawnShell(Find ~ " \"HelloWorld\"", p2.readEnd,
stdout);
wait (pid1);
wait (pid2);
wait (pid3);
return 0;
}
```
It is equal to:
* Windows: `echo HelloWorld | find "HelloWorld | find
"HelloWorld"`
* Linux: `echo HelloWorld | grep "HelloWorld | grep "HelloWorld"`
