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How about Groovy?

("ls".execute() | "grep -i old".execute()).waitForProcessOutput(System.out, System.out)

It can also be written as

"ls".execute().or("grep -i old".execute()).waitForProcessOutput(System.out, System.out)

It's not exactly the same because it uses a thread and a buffer instead of an OS pipe but I guess it's close enough.

I wonder why Groovy decided to map "or" to the shell's "|". Wouldn't it have made more sense to map "or" to the shell's "||" and "pipe" to the shell's "|"?

I think this is just how operator overloading works in Groovy: https://groovy-lang.org/operators.html#Operator-Overloading

"Or" is the name of the "|" operator. From the looks of it it's impossible to overload "||" in groovy.

By the way the "|" operator and the "or" method both call "pipeTo" directly so a third way to write it would be:

"ls".execute().pipeTo("grep -i old".execute()).waitForProcessOutput(System.out, System.out)

Why should I need to explicitly state that I want to wait for my process output? I'm in a shell, I put a `&` afterwards if I want things in the background. The model is synchronous by default.

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