在sed或awk中的两个匹配项之间的最后一行之前插入文本

Question

我有这样的文件：

subset {
    set {
        type "car"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
    }

这可以重复使用不同的“类型”

我想在“集合”中的最后一个}之前插入一些内容

所以它看起来像（不确定awk或sed是否可以某种方式检测到：D之前的行有多少空格）：

subset {
    set {
        type "car"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
        something
    }

我可以用

进行匹配

sed "/type.*.car.*/,/\} .... something here..."

文件，我只是想不通。。我找不到“轮子”，因为那可能有所不同。任何帮助将不胜感激。

Answer 1

这可能对您有用（GNU sed）：

sed '/\<type\>.*\<car\>/{h;:a;n;/^\s*}/!ba;x;s/\S.*/something/;G}' file

查找包含必需的type的行，复制该行，然后读取/打印后续行，直到以右花括号开头的行。交换回到复制的行，并用所需的字符串替换第一个非空格中的所有内容，然后添加包含右花括号的行并打印结果。

Answer 2

给出：

subset {
    set {
        type "car"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
    }
    set {
        type "second"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
    }

如果只想在键入“汽车”时添加“内容”，请运行以下命令：

perl -0777 -ape 's/set\h*{[^}]*type "car"[^}]*\K(?=\n\h+})/\n\tsomething/g' file.txt 
subset {
    set {
        type "car"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
        something
    }
    set {
        type "second"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
    }

说明：

s/          # substitute
  set           # literally
  \h*           # 0 or more horizontal spaces
  {             # opening curly brace
  [^}]*         # 0 or more non curly brace
  type "car"    # literally
  [^}]*         # 0 or more non curly brace
  \K            # forget all we have seen until this position
  (?=\n\h+})    # positive lookahead, make  sure we have after a linefeed and some horizontal spaces and a closing curly brace
/           # with
  \n            # linefeed
  \t            # a tab
  something     # whatever you want
/g          # end subs, global

Answer 3

这是另一个awk脚本（标准的Linux gawk）。

script.awk

/ +set {/,/ +}/{
    if($0 ~ /type "car"/ ) f = 1; 
    if($0 ~ / +}/ && f == 1) {
        print "        something";
        f = 0;
    }
}1

input.txt

subset {
    set {
        type "car"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
    }
    set {
        type "baot"
        product "nice"
        dealer "here"
        features "1"
        wheels 0
    }
    set {
        type "horse"
        product "too"
        dealer "very"
        features "2"
        wheels 0
    }
}

正在运行：

awk -f script.awk input.txt

输出：

subset {
    set {
        type "car"
        product "ww"
        dealer "something"
        features "0"
        wheels 4
        something
    }
    set {
        type "baot"
        product "nice"
        dealer "here"
        features "1"
        wheels 0
    }
    set {
        type "horse"
        product "too"
        dealer "very"
        features "2"
        wheels 0
    }
}