Bash script to convert romaji to hiragana

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http://ubuntuforums.org – I started learning Japanese not too long ago, and I'm tired of Anki, so I'm making my own, simple flash card program. I want to be able to have the option to read the Japanese in romaji (e.g. "mizu" instead of "water"), or have it automatically converted to hiragana (e.g. "みず" instead of "mizu"). Is there a way for me to use bash to convert the romaji to hiragana (or possibly katakana)? Basically, how hiragana works is that each letter represents a syllable, such as "da" (だ), with a single vowel, usually preceeded by a s (Hardware)