/dev


how userspace talks to devices

all devices need a major and minor number
       brw-------    1 gregkh   disk       3,   0 Jan 30 02:24 /dev/hda
       brw-------    1 gregkh   disk       3,  64 Jan 30 02:24 /dev/hdb
       crw-rw-rw-    1 root     uucp     188,   0 Jan 30 02:24 /dev/ttyUSB0
       crw-rw-rw-    1 root     uucp     188,   1 Jan 30 02:24 /dev/ttyUSB1

new major and minor number freeze during 2.3