Flowdock
test(command, file1, file2=nil) public

CommandProcessor#test(command, file1, file2) CommandProcessor#[command, file1, file2]

    command: char or String or Symbol
    file1:   String
    file2:   String(optional)
    return: Boolean
  same as:
    test()     (when command is char or length 1 string or symbol)
    FileTest.command (others)
  example:
    sh[?e, "foo"]
    sh[:e, "foo"]
    sh["e", "foo"]
    sh[:exists?, "foo"]
    sh["exists?", "foo"]
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