but it would be nice to have a way to control it.

You can already (indirectly) control it — at least in the direction of forcing the use of the shell.  Just add a dummy ";" to the command (which should always be possible without changing the semantics).  Or simply call sh -c "..." yourself.

(And be sure to add a comment regarding the ";", or else the next maintainer might remove that seemingly superfluous character again... :)

In reply to Re^4: capturing command output by Eliya
in thread capturing command output by morgon

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