tcpdump -i <number> - not just for Windows any more!

[Guy Harris <gharris () sonic net>]

ubu22-04$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04.5 LTS"
ubu22-04$ ifconfig -a
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.16.135.246  netmask 255.255.255.0  broadcast 172.16.135.255
        inet6 fe80::eee8:133e:43dd:472b  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:1c:d8:7f  txqueuelen 1000  (Ethernet)
        RX packets 637  bytes 651687 (651.6 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 544  bytes 80233 (80.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

                ...

wlx0013eff12e78: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 00:13:ef:f1:2e:78  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

I'm not going to type *that* string as an argument to -i.  ens33, OK, but not wlx0013eff12e78.

ubu22-04$ tcpdump -D
1.ens33 [Up, Running, Connected]
2.mon0 [Up, Running, Wireless, Associated]
3.any (Pseudo-device that captures on all interfaces) [Up, Running]
4.lo [Up, Running, Loopback]
5.wlx0013eff12e78 [Up, Wireless, Not associated]
6.nflog (Linux netfilter log (NFLOG) interface) [none]
7.nfqueue (Linux netfilter queue (NFQUEUE) interface) [none]
8.dbus-system (D-Bus system bus) [none]
9.dbus-session (D-Bus session bus) [none]

tcpdump -i 5, however, not too bad.
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