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• Use Oil Shell if you want a faster and more modern version of Bash that's compatible with it and offers more modern oil language.
• Use Zsh if you want better extendability and more plugins.
• Use Fish if you want perfect out of the box configuration and a more modern (and less verbose for most cases) scripting language.
• Use Dash/Ash if you want better speed and full POSIX compliance (no extension, no unimplemented features).
• Use Yash if you want better autocomplete but still faster than Bash.
• Use Xonsh if you want an awesome Python-based scripting experience and very nice autocomplete.
• Use Elvish if you want a more modern scripting language.
• Or use anything. Any shell will be better than Bash. Bash is slow, not POSIX compliant, and doesn't offer Zsh/Fish level autocomplete.