基于匹配模式将一行行 grep 到 shell 变量中

Question

我正在寻找一种方法来根据给定的模式在 {} 之间 grep 行块。我尝试了我在谷歌中找到的各种模式，但没有一个对我的情况有帮助。我不是正则表达式的专业人士。寻找一些帮助来解决这个问题。这是示例源文件：

Data {
        status 400;
        server_name test.dummy.com;

        location /test {
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_read_timeout 5m;
proxy_send_timeout 5m;
proxy_pass http://xyz.9201.com;

               proxy_http_version 1.1;
               proxy_set_header Upgrade $http_upgrade;
               proxy_set_header Connection "upgrade";
        }

        location /dev {
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_read_timeout 5m;
proxy_send_timeout 5m;
proxy_pass http://xyz.9202.com;

               proxy_http_version 1.1;
               proxy_set_header Upgrade $http_upgrade;
               proxy_set_header Connection "upgrade";
        }

        location /prd {
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_read_timeout 5m;
proxy_send_timeout 5m;
proxy_pass http://xyz.9203.com;

               proxy_http_version 1.1;
               proxy_set_header Upgrade $http_upgrade;
               proxy_set_header Connection "upgrade";
        }
}

如果传递给脚本的参数是 "dev" ，那么它应该匹配模式位置/dev 并将下面的块提取到 shell 变量中：

位置/开发{

proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_read_timeout 5m;
proxy_send_timeout 5m;
proxy_pass http://xyz.9202.com;
               proxy_http_version 1.1;
               proxy_set_header Upgrade $http_upgrade;
               proxy_set_header Connection "upgrade";

我尝试了各种 sed/awk 命令模式，但下面的这个给了我一些最接近的结果。

awk '/dev/{print}' RS={ FS=} test.conf

结果：

$ awk '/dev/{print}' RS={ FS=} test.txt

proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_read_timeout 5m;
proxy_send_timeout 5m;
proxy_pass http://xyz.9201.com;

               proxy_http_version 1.1;
               proxy_set_header Upgrade $http_upgrade;
               proxy_set_header Connection "upgrade";
        }

        location /dev

Answer 1

我们可以单独完成awk，请您尝试跟随。

awk '/}/ && found{exit} /location \/dev/{found=1;next} found && NF' Input_file

由于 OP 提到只应打印第 1 组，因此我使用exit此处在第一组打印后立即退出。

说明：为上述代码添加说明。

awk '                   ##Starting awk program from here.
/}/ && found{           ##Checking condition if a line contains } AND variable found is SET then do following.
  exit                  ##Exiting from program here.
}                       ##Closing BLOCK for above condition here.
/location \/dev/{       ##Checking condition here if a line contains location /dev then do following.
  found=1               ##Setting variable found to 1 here.   
  next                  ##next will skip all further statements from here.
}                       ##Closing BLOCK for above condition here.
found && NF             ##Checking condition is  found is SET and NF is NOT NULL then print current line.
' Input_file            ##Mentioning Input_file name here.

输出如下。

proxy_set_header X-Forwarded-Host ;
proxy_set_header X-Forwarded-Server ;
proxy_set_header X-Forwarded-For ;
proxy_set_header Host ;
proxy_read_timeout 5m;
proxy_send_timeout 5m;
proxy_pass http://xyz.9202.com;
               proxy_http_version 1.1;
               proxy_set_header Upgrade ;
               proxy_set_header Connection "upgrade";