MAKEFILENAME - Create a unique, non-existent file name

Syntax:	MAKEFILENAME	[ file name ] [ ext ] [ dir ] [ prefix ]
Arguments:	[ file name ]	A variable where the new file name is saved.
	[ ext ]	A variable or string defining the file name extension (if [ ext ], [ dir ], and [ base ] options are omitted, .tmp is used as the default extension).
	[ dir ]	A variable or string defining the target folder for the file (if [ dir ] and [ base ] are omitted, the current working folder is used).
	[prefix]	A variable or string defining the desired file name prefix; a four digit number will be appended to the prefix to make it unique (if omitted robo is used).
Options:	none

This script command creates a unique name for a non-existent file and saves it in a specified script variable. This variable may be used in any Robo-FTP command that needs a uniquely named file. The file is not created until it is used in a command.

It is not required to specify [ ext ], [ dir ], or [ base ], however the arguments are position dependent, so [ base ] requires both [ ext ] and [ dir ] to be present, and [ dir ] requires [ ext ].

The file name returned by this command will not exist at the time the command is run, but there is no guarantee that a file of this name will not be created by some other program, so choose a naming combination that is unlikely to be used by any other program and use the file immediately after the name is generated.

Consider the following example in which only the [ file name ] variable is present. The file name created would resemble c:\program files\robo-ftp\roboXXXX.tmp, where XXXX would be 0001, 0002, etc. depending on whether there is a previously existing file or not.