requireVariable: Ask user the value of a variable
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Description Usage Arguments Value

In interactive mode, this functions asks the user to type the value of a given variable. In non-interactive mode, it searchs the value in the command line arguments and it returns an error if the value does not exist.

1 2	requireVariable(name, desc = NULL, default = NULL, what = character(), nmax = 1, alwaysAsk = TRUE, env = .GlobalEnv)

`name`	Name of the required variable
`desc`	Description to display
`default`	Default value for the variable
`what`	Type of data to read in interactive mode.
`nmax`	Number of values to read in interactive mode.
`alwaysAsk`	If the variable already exists, should the function ask a new value?
`env`	Environment where the variable should be defined