Autocomplete on OpenWrt

How does the autocomplete work and more importantly how can I add stuff to it? It seems to be very easy on bash, but with only ash available I'm lost.

According to https://en.wikipedia.org/wiki/Comparison_of_command_shells#Interactive_features ash doesn't have any completion function.

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ash does not use the same mechanism as bash, so it may not be extended like bash. bash relies on the built-in command "complete" to configure this while ash has it compiled in. See BUSYBOX_CONFIG_FEATURE_TAB_COMPLETION for generic completion and BUSYBOX_CONFIG_FEATURE_USERNAME_COMPLETION for home completion.
Thus, ash only have the most basic completions like directories, tilde and $PATH, but that is all I need, so I'm happy with that.

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Thank you guys, switched to bash and wrote custom auto-complete for that.