在awk或sed中转换pcregrep命令

convert pcregrep command in awk or sed

我有一个多行匹配的pcregrep命令，我想将其转换为awk或sed命令，因为我需要在pcregrep不可用的计算机(OS X)上使用它。

原始命令：

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ifconfig -a | pcregrep -M '^[a-z].*\
(\\t[^\
]+\
)+\\t[^\
]+baseTX' | grep -oE"^([a-z]+[^:]+)"

它输出包含字符串a？baseTXa？的接口的名称。 (这是我发现可以可靠地找出MacBook上以太网接口名称的唯一方法)。就我而言，是€en4a€。

输入文本如下：

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lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
nd6 options=1<PERFORMNUD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether xx:xx:xx:xx:xx:xx
inet6 xxxx::xxxx:xxxx:xxxx:xxx%en0 prefixlen 64 scopeid 0x4
inet 10.xxx.xxx.xx netmask 0xffffff00 broadcast 10.xxx.xxx.255
inet6 xxxx:xxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx prefixlen 128
nd6 options=1<PERFORMNUD>
media: autoselect
status: active
en5: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
options=60<TSO4,TSO6>
ether xx:xx:xx:xx:xx:xx
media: autoselect <full-duplex>
status: inactive
en6: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
options=60<TSO4,TSO6>
ether xx:xx:xx:xx:xx:xx
media: autoselect <full-duplex>
status: inactive
en4: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=4<VLAN_MTU>
ether xx:xx:xx:xx:xx:xx
inet6 xxxx::xxxx:xxxx:xxxx:xxxx%en4 prefixlen 64 scopeid 0x7
inet XX.XXX.XXX.XX netmask 0xffffff00 broadcast XX.XXX.XXX.XXX
inet6 xxxx:xxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx prefixlen 128
nd6 options=1<PERFORMNUD>
media: autoselect (100baseTX <full-duplex>)
status: active
bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=63<RXCSUM,TXCSUM,TSO4,TSO6>
ether xx:xx:xx:xx:xx:xx
Configuration:
id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
ipfilter disabled flags 0x2
member: en5 flags=3<LEARNING,DISCOVER>
ifmaxaddr 0 port 5 priority 0 path cost 0
member: en6 flags=3<LEARNING,DISCOVER>
ifmaxaddr 0 port 6 priority 0 path cost 0
nd6 options=1<PERFORMNUD>
media: <unknown type>
status: inactive
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
ether xx:xx:xx:xx:xx:xx
media: autoselect
status: inactive

我该如何抓取？en4a€？用awk还是sed？我试了一个小时，但我对sed和awk不好。