Question

我有一个运行某些应用程序的网络服务器。我从服务器执行grep以查看已连接到服务器的所有IP。我实现了它，但HTML看起来像这样：

172.17.100.37 172.17.100.45 172.17.222.158

我希望看到这样：

172.17.100.37 
172.17.100.45 
172.17.222.158

要获得这些值，我会这样做：

cmd = "grep -o '^[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' /var/log/apache2/access.log | sort | uniq "

关于我能做什么的任何想法？

编辑：access.log显示如下：

172.17.222.158 - - [30/Jan/2014:09:33:11 +0000] "GET /cgi-bin/right.cgi HTTP/1.1" 204  219 "http://172.17.223.72/index2.html?fname=172.17.223.75" "Mozilla/5.$
172.17.222.158 - - [30/Jan/2014:09:33:11 +0000] "GET /cgi-bin/stop.cgi HTTP/1.1" 204 218 "http://172.17.223.72/index2.html?fname=172.17.223.75" "Mozilla/5.0$
172.17.222.158 - - [30/Jan/2014:09:33:12 +0000] "GET /cgi-bin/right.cgi HTTP/1.1" 204 218 "http://172.17.223.72/index2.html?fname=172.17.223.75" "Mozilla/5.$
172.17.222.158 - - [30/Jan/2014:09:33:12 +0000] "GET /cgi-bin/stop.cgi HTTP/1.1" 204

依旧......

Answer 1

据我所知，您将grep-command的输出粘贴到HTML文件中。要获得换行，您可以使用预标签：
＆lt; pre＆gt; （您的输出到此处） ＆lt; / pre＆gt;
这将在HTML中显示您的换行符。

Answer 2

使用tr

echo "172.17.100.37 172.17.100.45 172.17.222.158" | tr ' ' '\n'
172.17.100.37
172.17.100.45
172.17.222.158

使用awk

cat file
172.17.222.158 - - [30/Jan/2014:09:33:11 +0000] "GET /cgi-bin/right.cgi HTTP/1.1" 204  219 "http://172.17.223.72/index2.html?fname=172.17.223.75" "Mozilla/5.$
172.17.222.158 - - [30/Jan/2014:09:33:11 +0000] "GET /cgi-bin/stop.cgi HTTP/1.1" 204 218 "http://172.17.223.72/index2.html?fname=172.17.223.75" "Mozilla/5.0$
172.17.222.158 - - [30/Jan/2014:09:33:12 +0000] "GET /cgi-bin/right.cgi HTTP/1.1" 204 218 "http://172.17.223.72/index2.html?fname=172.17.223.75" "Mozilla/5.$
172.17.222.158 - - [30/Jan/2014:09:33:12 +0000] "GET /cgi-bin/stop.cgi HTTP/1.1" 204

awk -F/ '{print $8}' file
172.17.223.72
172.17.223.72
172.17.223.72

格式化grep命令的输出

2 个答案: