$existsUser

Examines if a user with the given name exists.
Syntax
    $existsUser{username}
DocumentationExamines if a user with the given name exists:

    Parameters:
      username, the name of the user whos existance is to be examined.
    Returns:
      1 if and only if the user with the given name exists; 0 otherwise.
Examples
Example 1:
    $createUser{Jack}
    {secret}
    $existsUser{Jack}

    Result 1:
    creates user with username and password, user "Jack"
    exists:
    1 - (true - user exists)
Example 2:
    $createUser{Jack1}
    {secret1}
    $if {$existsUser{Jack1}}
    {User Jack1 exists.}
    {User Jack1 does not exist.}

    Result 2:
    creates user with username and password, user "Jack1"
    exists:
    User Jack1 exists
GroupSecurity
Minimum required transaction-mode:READ
Required scripting permission of the developerPERMISSION_FL_ADMINISTRATIVE
Minimum parameters1
Maximum parameters 2
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