sed魔术通缉:
我想知道如何保存/记住一条线(如标题部分(而不立即打印
并在以下行中的某个地方找到其他某些东西,
但是,保存/记忆的标头零件应仅打印一次,以下任何数量的以下其他匹配项下方的其他匹配项
,如果在记住标头线的下面的任何以下行中都没有其他东西的匹配,则根本不应打印它
因此,对于ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.94.0.2 netmask 0xff000000
inet 127.94.0.1 netmask 0xff000000
nd6 options=201<PERFORMNUD,DAD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
XHC20: flags=0<> mtu 0
en3: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=10b<RXCSUM,TXCSUM,VLAN_HWTAGGING,AV>
ether 68:5b:35:c1:b3:91
inet6 fe80::8ef:5953:53b:7058%en3 prefixlen 64 secured scopeid 0x5
inet 192.168.0.2 netmask 0xffffff00 broadcast 192.168.0.255
inet6 2a02:810d:9c0:59bb:c0d:c8af:7e27:42f1 prefixlen 64 autoconf secured
inet6 2a02:810d:9c0:59bb:643f:a2cb:ac5f:7c71 prefixlen 64 autoconf temporary
nd6 options=201<PERFORMNUD,DAD>
media: autoselect (1000baseT <full-duplex,flow-control,energy-efficient-ethernet>)
status: active
en0: flags=8823<UP,BROADCAST,SMART,SIMPLEX,MULTICAST> mtu 1500
ether 6c:40:08:9c:45:ce
nd6 options=201<PERFORMNUD,DAD>
media: autoselect (<unknown type>)
status: inactive
使用ifconfig | gsed -n -E '/^[a-z0-9]*:/h; /tinet (addr:)?[0-9.a-fA-F:]*/{x;p;x;p}'
我得到了(这已经很棒,但不好(:
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.0.0.1 netmask 0xff000000
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.94.0.2 netmask 0xff000000
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet 127.94.0.1 netmask 0xff000000
en3: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.0.2 netmask 0xffffff00 broadcast 192.168.0.255
,但结果我只想为所有IPS获取一次标题(没有混乱(
lo0:
inet 127.0.0.1
inet 127.94.0.2
inet 127.94.0.1
en3:
inet 192.168.0.2
您可以尝试一次。
Your_command | awk '
/^[a-zA-Z]+/{
count=""
val=$1
next
}
val && match($0,/.*[0-9]+.[-0-9]+.[0-9]+.[0-9]+ +/){
if(++count==1){
print val
}
value=substr($0,RSTART,RLENGTH)
sub(/ +$/,"",value)
print value
value=""
}
'
,所以我想出了如何在昨晚做的:(
ifconfig | gsed -n -E '
/^[a-z0-9]*:/ { # for lines starting with this
s/^([a-z0-9]*:).*/1/;h # extract the start and put it into hold space
}
/tinet (addr:)?[0-9.a-fA-F:]*/ { # for lines containing this
s/^.*(tinet (addr:)?[0-9.a-fA-F:]*).*/1/ # extract it
x # swap hold space and pattern space
G # and then append the hold space (former pattern space) to it
s/^n// # replace leading n if former hold space was empty
p # print the concatenated former hold space and modified pattern space
s/^.*$// # empty the pattern space
x # swap the now empty pattern space to hold space
}
'
或(或多或少(一线:
ifconfig | gsed -n -E '
/^[a-z0-9]*:/ { s/^([a-z0-9]*:).*/1/;h };
/tinet (addr:)?[0-9.a-fA-F:]*/ { s/^.*(tinet (addr:)?[0-9.a-fA-F:]*).*/1/;x;G;s/^n//;p;s/^.*$//;x}'
给我希望
lo0:
inet 127.0.0.1
inet 127.94.0.2
inet 127.94.0.1
en3:
inet 192.168.0.2
我有两个建议:
- 清洁输入线时,有时更容易删除而不是选择。
- 在这种情况下,以持有空间的最终输出收集更容易。
例如:
parse.sed
/^[^ ]+/ { # For lines starting with non-space
x #
/n/p # Did we collect any IP addresses?
x # /
s/ .*// # Clean up interface name
h # Overwrite hold-space
}
/inet / {
s/ netmask.*//
H # Collect ip addresses in hold-space
}
$ {
x # Print the last interface if
/n/p # it contained IP addresses
}
这样运行:
ifconfig | gsed -nEf parse.sed
输出:
lo0:
inet 127.0.0.1
inet 127.94.0.2
inet 127.94.0.1
en3:
inet 192.168.0.2
sed用于做简单的 s/old/new
,,即全部,对于其他任何东西,只需使用尴尬:
$ ifconfig | awk '/^[[:alpha:]]/{hdr=$1 ORS} $1=="inet"{print hdr " " $1, $2; hdr=""}'
lo0:
inet 127.0.0.1
inet 127.94.0.2
inet 127.94.0.1
en3:
inet 192.168.0.2
这可能对您有用(gnu sed(:
sed -En '/^S/h;s/^(s+inets+S+).*/1/;T;x;s/s.*//p;x;p' file
将标题线存储在保留空间中。
删除包含inet
的行的IP地址。
如果替代是不成功的,请救助。否则,返回到保持空间,然后尝试删除标题线的末端并打印。
返回模式空间并打印原始的IP地址行。
n.b。标题只会打印一次,因为替换已经在编辑线后会失败。