Cormac Shannon 1766e40a68 Implement $(cmd) subcommand syntax in commands (issue #27) ...

Add $() for inline subcommand substitution that runs a command and
inserts its stdout (trailing newlines stripped) into the outer command
string. Supports nesting, and mixing with ${expr} and $NAME.

2026-03-18 09:29:51 +00:00

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