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zsh has the regular command alias covered in Section 29.4. zsh is compatible with the C shell in many ways, but it doesn't accept csh alias syntax without an equal sign (= ) between the name and value. That's probably because, as in other Bourne-type shells, zsh allows you to set multiple aliases with one command, like this:
zsh$ alias ri='rm -i' mi='mv -i' ...and so on