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i'm actually way too into `./pants options` because you can grep it

e.g. `./pants options | grep --color -E 'file\b'` would have answered this too

`--positional-arg-file=/dev/stdin` is the key part here

Hm.

```./pants --spec-file=$(./pants --no-v2-ui dependees helloworld/util) list

ERROR: [Errno 2] No such file or directory: 'helloworld:config'```

i think there needs to be some quoting there

there is bash syntax for “named file handle for subprocess” though

Yayy this works! `./pants --spec-file=&lt;(./pants --no-v2-ui dependees helloworld/util) list`

<https://github.com/pantsbuild/pants/issues/5385>

I wish `./pants --no-v2-ui dependees helloworld/util | ./pants list` worked, but this is fine for now. (I’m adding <https://pants.readme.io/docs/advanced-target-selection>)

`xargs` is a unix tool to take `stdin` and turn it into args to a process

yes, but I mean what is the actual command to use this (if you know off the top of your head)

```./pants --no-v2-ui dependees helloworld/util | xargs ./pants list```

(but, piping pants to pants is _also_ problematic with pantsd for a different reason <https://github.com/pantsbuild/pants/issues/7654> … which we can resolve in v2, but which is challenging to resolve with v1 in place)

am i correct in thinking there's currently no easy way to merge digests without having pants error on duplicate entries?

if so, i think a small change to `fs.py` using `SnapshotSubset` might work, so not a problem

it is turning out to be super small and good

duplicate but non-identical entries is an error, yea.