Sort the lines in a file and write them back to the same file:
USING: io io.encodings.utf8 io.files sequences sorting ;
"lines.txt" utf8 [ file-lines natural-sort ] 2keep set-file-lines
Read 1024 bytes from a file:
USING: io io.encodings.binary io.files ;
"data.bin" binary [ 1024 read ] with-file-reader