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(zsh.info)Command Substitution

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Command Substitution
====================

A command enclosed in parentheses preceded by a dollar sign, like
`$(...)', or quoted with grave accents, like ``...`', is replaced with
its standard output, with any trailing newlines deleted.  If the
substitution is not enclosed in double quotes, the output is broken
into words using the IFS parameter.  The substitution `$(cat FOO)' may
be replaced by the equivalent but faster `$(<FOO)'.  In either case, if
the option GLOB_SUBST is set, the output is eligible for filename
generation.