appendto(<sFileName>)
Description (from LUA 4 Manual: 6.4 I/O Facilities
"Opens a file named <sFileName> and sets it as the value of _OUTPUT. Unlike the writeto operation, this function does not erase any previous contents of the file; instead, anything written to the file is appended to its end. If this function fails, it returns nil, plus a string describing the error."
Example
Arguments
<sFileName>: the name of the file to append to.
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