Mercurial commands for developer [closed]

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What are the commands the developer must know in mercurial SCVS ultimately? apart from commit,pull data,push,clone? and I am always collapsing heads and branches fault in mercurial? How will you handle these knd开发者_StackOverflow中文版a situation?

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the most useful command for you is

$ hg help

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I think the best source is here.