Hola,
veis esta salida de grep lógica? ya lo he probado en varios equipos y nada.
cenicero@pc1:~$ tcpdump -V | grep holahola
tcpdump version 4.0.0
libpcap version 1.0.0
Usage: tcpdump [-aAdDefIKlLnNOpqRStuUvxX] [ -B size ] [ -c count ]
[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]
[ -i interface ] [ -M secret ] [ -r file ]
[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]
[ -y datalinktype ] [ -z command ] [ -Z user ]
[ expression ]
Al igual , si redirijo la salida a un fichero, éste sale vacío...
cenicero@pc1:~$ tcpdump -V > prueba.txt
tcpdump version 4.0.0
libpcap version 1.0.0
Usage: tcpdump [-aAdDefIKlLnNOpqRStuUvxX] [ -B size ] [ -c count ]
[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]
[ -i interface ] [ -M secret ] [ -r file ]
[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]
[ -y datalinktype ] [ -z command ] [ -Z user ]
[ expression ]
cenicero@pc1:~$ cat prueba.txt
cenicero@pc1:~$
A alguien más le ocurre? (me sale en Ubuntu 10.04 32 y 64 bits).
Gracias.
