Unadorned echo may or may not support a particular option, dependent on if it is a shell (which one?) built in or an external command. See the start & the bottom of GNU echo invocation; mix in korn-shell (sic) for extra fun.

Variable expansion(substitution) is also shell dependent ...

In reply to Re^4: Road to a readable path (unix, non-perl) by parv
in thread Road to a readable path by wol

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