All of these are useful:
@FILECLOSE Close a file handle
@FILEOPEN Open a file handle
@FILEREAD Read next line from a file handle
@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
@TRUNCATE Truncate the file at the current position of the file handle pointer.
but none allow me to delete a line in a file?
@FILECLOSE Close a file handle
@FILEOPEN Open a file handle
@FILEREAD Read next line from a file handle
@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
@TRUNCATE Truncate the file at the current position of the file handle pointer.
but none allow me to delete a line in a file?