如果IP相同，则合并两个/ etc / hosts文件

Question

I need merge two /etc/hosts files in unique file only if the IP adress is the same.

File 1 contains:

172.27.88.143   node1
172.23.171.42   node2
172.23.171.36   node3
172.27.88.136   node4
172.27.88.137   node5
172.27.88.138   node5
172.27.88.200   node6

File 2 contain:

172.27.88.200   node6.domain.corp
172.27.88.158   node7.domain.corp

The result file must be:

172.27.88.143   node1
172.23.171.42   node2
172.23.171.36   node3
172.27.88.136   node4
172.27.88.137   node5
172.27.88.138   node5
172.27.88.200   node6   node6.domain.corp

I need to it on Linux systems. That's possible?

Thanks in advace for your time

Answer 1

跟随awk可能会对您有所帮助。

awk 'FNR==NR{a[$1]=$2;next} {print $0,a[$1]?"\t" a[$1]:a[$1]}' FILE2 FILE1

Answer 2

A loop rather than a one-liner, but this should work when f1 and f2 are variables for the two /etc/hosts files:

while read line; do
    ip="$(echo "${line}" | awk '{print $2}')"
    secondName="$(grep "${ip}" "${f2}" | awk '{print $2}')"

    echo "${line} ${secondName}"
done < "${f1}"

The output contains some trailing space, which can be removed by piping the echo-line through | sed 's/ \\+$//' | sed 's/ \\+$//' .