将文本文件中的tcpdump输出写入一行 [英] Write tcpdump output in a text file into a single line

问题描述

我想将文本输出中的所有行连接成一行. 使用以下命令，我可以监视DHCP流量:

I want to concatenate all lines in text output into one line. With the following command I can monitor DHCP traffic:

tcpdump -lni eth0 -vvv -s 1500 '((udp port 67) and (udp[247:4] = 0x63350103))' | grep --line-buffered -E -i 'client-id|requested-ip|hostname'

对于每个新连接，我都会在新行中看到3个结果(IP，MAC，主机名).

For every new connection I see 3 results ( IP, MAC, Hostname ) every one of them on a new line.

是否可以将每个结果都写入这三个结果，但只能写入一行并写在文件上?

That's possible to write this three every results but into only one line and write on a file?

推荐答案

使用tr删除带有-d的换行符.在我的机器上运行并使用en0而不是eth0，我在一行上看到了这一点:

Use tr to remove newlines with -d. Running on my machine and using en0 instead of eth0, I see this on one line:

$ tcpdump -lni en0 -vvv -s 1500 '((udp port 67) and (udp[247:4] = 0x63350103))' | grep --line-buffered -E -i 'client-id|requested-ip|hostname' | tr -d '\n' > output.txt
$ cat output.txt
        Client-ID Option 61, length 7: ether 6c:96:cf:d8:7f:e7      Requested-IP Option 50, length 4: 172.31.99.198     Hostname Option 12, length 3: "mbp"

>将覆盖具有stdin内容的文件.
查看tr的联机帮助页.

> Will overwrite a file with contents of stdin.
Check out tr's manpage.

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