I convert .txt files to .ps files with enscript, OK! After that I use "ps2pdf" to convert the .ps files to .pdf files. OK!
And I can see:
Question: What parameter do I have to use (with enscript or ps2pdf) to give the PDF's custom "$subject" name (I don't want "Enscript Output" title on the top of my PDF reader).
So this is not about the filenames, this is about the "$subject" that a PDF file has.