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Bash is included in the Syllable base system, although I can't remember off-hand which version (but it's fairly new).
See http://kamidake.other-space.com for other Syllable software (where most new native apps are posted).
Syllable currently runs Bash 2.03, and we plan to start testing Bash 3.x soon. We're very conservative when it comes to Bash because it's such a critical component.