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@TRUNCATE[handle] : Truncate the file opened for write access by @FILEOPEN at the current position of the file pointer, where handle is the value returned by @FILEOPEN.
See also the related handle-based functions:
| @FILECLOSE | Close a file handle |
| @FILEOPEN | Open a file handle |
| @FILEREAD | Read next line from a file handle |
| @FILESEEK | Move a file handle pointer |
| @FILESEEKL | Move a file handle pointer to a specified line |
| @FILEWRITE | Write next line to a file handle |
| @FILEWRITEB | Write data to a file handle |