The function LINEOUT()

The function <LINEOUT never deletes the output file. To rewrite a file, 
you must delete it with <DEL (or <SysFileDelte, if using REXXUTIL) and 
than recreate it. 

To empty the file without deleting it you can use the OS/2 commad 

 
  type nul >filename

In Object-Oriented REXX you can use a new option for the <STREAM to open a 
file in "overwrite" mode (see also The function LINEOUT() in Object REXX).