Each script can contain only one function, usually, it's "main", but you can define it however you want, This function can have arguments and will be executed when you send a transaction with your script.
With execute command you can pass arguments to script function, see help:
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dncli tx vm execute --help
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Dncli"execute" supports different kind of arguments, as:
Boolean values. Example: true, false.
U64, U8, U128 values (unsigned integers).
vector\ values (hex). Can be used for string values. Example: 0x68656c6c6f2c20776f726c6421.