bash - 如何从配置文件中匹配花括号 {} 中的字符串和打印行

Question

我想打印{和}中的行，并在 Hostgroups 中分配 where "mango"

   object Host "os.google.com" {
    import "windows"
    address = "linux.google.com"
    groups = ["linux"]
    }

    object Host "mango.google.com" {
    import "windows"
    address = "mango.google.com"
    groups = ["linux"]

    assign where "mango" in Hostgroups
    }

期望的输出：

    object Host "mango.google.com" {
    import "windows"
    address = "mango.google.com"
    groups = ["linux"]

    assign where "mango" in Hostgroups
    }

Answer 1

假设}在您的输入中没有出现在任何其他上下文中：

$ awk -v RS='}' '
    /assign where "mango" in Hostgroups/ {
        sub(/^[[:space:]]+\n/,"")
        print $0 RS
    }
' file
    object Host "mango.google.com" {
    import "windows"
    address = "mango.google.com"
    groups = ["linux"]

    assign where "mango" in Hostgroups
    }

Answer 2

这可能对您有用（GNU sed）：

sed -n '/{/h;//!H;/}/{g;/assign where "mango" in Hostgroups/p}' file

使用该选项关闭 seds 自动打印，-n并在花括号之间的保持空间中收集线条。在右花括号之后，将其替换为保留空间的内容，如果匹配则assign where "mango" in Hostgroup打印它。

Answer 3

试试这个awk脚本

script.awk

/{/,/}/ { #define record range from { to }
    if ($0 ~ "{") rec = $0; # if record opening reset rec variable with current line
    else rec = rec "\n" $0; # else accumulate the current line in rec
    if ($0 ~ /assign where "mango" in Hostgroups/) { # if found exit pattern in current line
        print rec; # print the rec
        exit;      # terminate
    }
}

处决：

awk -f script.awk input.txt

输出：

object Host "mango.google.com" {
import "windows"
address = "mango.google.com"
groups = ["linux"]

assign where "mango" in Hostgroups