While "Hello all" is used occasionally, "Hello everybody", or, "Hello everyone" is more common.
"He told me all" is fine. "All like Betty" presents a problem in that it has at least two meanings - all of the people like (adore, are attracted to, see her as a nice person) Betty, and, all of the people who are similar to Betty - "All like Betty step forward" (possibly meaning every person who is female, tall, blond, and has short hair). "He told me all" makes sense, but it doesn't convey much information. He told you all of what? If he was to tell you all he might spend the rest of his life giving you information. To make this work you would have to put a limit on what he told you - "He told me all about the fight last night". In short, attempt to analyze what you are going to say to see if it makes sense.

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