套件： buffer (1.19-12build1)

Buffering/reblocking program for tape backups, printing, etc.

Buffer implements double buffering and can be used to keep backup tapes streaming or printers printing. It can also be used to convert a data stream to a given output blocksize.

Buffer uses shared memory to convert a variable input data rate to a constant output data rate. It is typically used in a pipe between a backup program and the tape device, but there are also other applications like buffering printer data in lpd's input filter.