Pipe one shell command into another

[Griffon26 via Digitalmars-d-learn]

On Saturday, 30 January 2016 at 15:12:26 UTC, Andrew wrote:
>   foreach(line; pipesLs.stdout.byLine)
>     pipesSort.stdin.writeln(line);

Because you write sort's input first and read its output later, 
it might end up blocking if ls generates too much data. The 
output pipe of sort will fill up, causing sort to block and not 
read data from its input pipe anymore, resulting in your program 
blocking when the input pipe has filled up.

I have a piece of code using poll to write to two input pipes and 
read from one output pipe, but it's a bit more complex than what 
you need. However, it also uses pipeShell to specify multiple 
commands at once. Since your program only needs to read the 
output (and not generate input), you may find pipeShell useful.

https://github.com/Griffon26/tdiff3/blob/87709dd51c279e9896f37ba1cef477a525e44562/source/gnudiff.d

Disclaimer: I'm not an experienced D programmer. My D code may 
not be pretty =)