linux - 在跨越多行的模式之后如何在文件中插入一行

Question

我想在 bash 第一次出现这种模式后立即插入一行。我会怎么做呢？我想尝试使用模式来匹配 location/{*}

    location / {
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            try_files $uri $uri/ =404;
            # Uncomment to enable naxsi on this location
            # include /etc/nginx/naxsi.rules
    }

我希望它成为

    location / {
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            try_files $uri $uri/ =404;
            # Uncomment to enable naxsi on this location
            # include /etc/nginx/naxsi.rules
    }
    location /hbnb_static

谢谢，非常感谢您的帮助。

Answer 1

我尝试了 Perl 单行代码:

perl -e '$s.=$_ while <>; $s=~s|location / \{.*?\}|$&\n    location /hbnb_static|s; print $s' inputfile

一些解释:

• 将 inputfile 插入变量 $s
• s 正则表达式修饰符使 . 也匹配换行符
• .*? 是惰性的，所以遇到后续的}
就停止
• 我假设您也想在插入的行前面缩进 4 个空格。
• 将结果打印到标准输出

将其制作成一个 bash 脚本，该脚本在命令行上读取 STDIN 或文件，并将修改后的文本打印到标准输出:

#!/bin/bash
perl -e '$s.=$_ while <>; $s=~s|location / \{.*?\}|$&\n    location /hbnb_static|s; print $s' $1