Where to find examples of text-file with initials

Where can I find examples of what the text-file cointaining initials should look like?
I am working in R. Thanks,

In R, you wouldn’t specify a text file. You specify a list (of list) of initial values. As explained in help(stan), the init argument can be

Set inital values by providing a list equal in length to the number of chains. The elements of this list should themselves be named lists, where each of these named lists has the name of a parameter and is used to specify the initial values for that parameter for the corresponding chain.

Thank you:-)