I think the documentation is correct, I think this is an
implementation bug/limitation. J addons and base library append
an & to y as workaround.

Чт, 01 дек 2016, Xiao-Yong Jin написал(а):
> Dictionary says:
> 
>    2!:1 y     Spawn. (Unix only.) Like 2!:0, but yields '' without waiting 
> for the host to finish. Any output is ignored. For example, 2!:1 can be used 
> to invoke a text-editor.
> 
> But I tested on Linux and Mac, 2!:1 on both still waits for the process to 
> finish.
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