Radi sa --line-buffered.
E, sad imam novi problem :-). Kod komande
tcpdump -i nas0 -l | grep LCP --line-buffered >>/var/log/adsl Povremeno se desi da mi izgubi deo zapisa koji treba da ubaci u fajl, a ako radim preusmeravanje na /dev/tty12 umesto u fajl to se ne dešava. Evo primer iz fajla:
00:27:55.429761 PPPoE [ses 0x834] LCP, Echo-Request (0x09), id 111, length 14
00:27:55.429915 PPPoE [ses 0x834] LCP, Echo-Reply (0x0a), id 111, length 14
00:27:55.990395 PPPoE [ses 0x2fd] LCP, Echo-Request (0x09), id 217, length 10
00:27:55.998683 PPPoE [ses 0x2fd] LCP, Echo-Reply (0x0a), id 217, length 10
st (0x09), id 214, length 10
00:27:14.436608 PPPoE [ses 0x834] LCP, Echo-Reply (0x0a), id 214, length 10
00:27:15.372473 PPPoE [ses 0x834] LCP, Echo-Request (0x09), id 107, length 14
00:27:15.372621 PPPoE [ses 0x834] LCP, Echo-Reply (0x0a), id 107, length 14
00:27:15.959851 PPPoE [ses 0x2fd] LCP, Echo-Request (0x09), id 209, length 10
00:27:15.968398 PPPoE [ses 0x2fd] LCP, Echo-Reply (0x0a), id 209, length 10
i još jedan:
00:28:39.579252 PPPoE [ses 0x834] LCP, Echo-Request (0x09), id 231, length 10
00:28:39.587472 PPPoE [ses 0x834] LCP, Echo-Reply (0x0a), id 231, length 10
00:28:41.067284 PPPoE [ses 0x2fd] LCP, Echo-Request (0x09), id 226, length 10
00:28:41.075268 PPPoE [ses 0x2fd] LCP, Echo-Reply 00:28:42.023124 PPPoE [ses 0x2fd] LCP, Echo-Request (0x09), id 113, length 14
00:28:42.023263 PPPoE [ses 0x2fd] LCP, Echo-Reply (0x0a), id 113, length 14
00:28:44.583258 PPPoE [ses 0x834] LCP, Echo-Request (0x09), id 232, length 10
00:28:44.591764 PPPoE [ses 0x834] LCP, Echo-Reply (0x0a), id 232, length 10
00:28:45.509628 PPPoE [ses 0x834] LCP, Echo-Request (0x09), id 116, length 14
00:28:45.509776 PPPoE [ses 0x834] LCP, Echo-Reply (0x0a), id 116, length 14