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如何将一个文件的选定内容插入到另一个文件的模式后面？

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如何将一个文件的选定内容插入到另一个文件的模式后面？

我想从 file1 中提取 [abc] 下的 IP，并用它们替换文件 2 中的主机列表：

文件1：

[abc]
192.168.29.153
192.168.29.155
[def]
192.168.29.153
[xyz]
192.168.29.153

文件2：

output.logstash:
  # The Logstash hosts
  hosts: ["192.168.29.115:5044"]

  # Optional SSL. By default is off.
  # List of root certificates for HTTPS server verifications
  #ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]

  # Certificate for SSL client authentication
  #ssl.certificate: "/etc/pki/client/cert.pem"

答案1

我想这样就可以了，如果awk可以的话。

#! /usr/bin/awk -f

# here, NR is record number, and FNR is *file* record number - this matches only 
# in first file
NR == FNR {
    # if first field matches
    if ($1 ~ /abc/) {
        # arrange addresses with `", "` between them
        abc=$2
        for (i=3; i<=NF; i++) abc = abc "\", \"" $i
    } 
    # then we're finished with this file.
    next;
}

$1 ~ /hosts/ {
    # print the saved addresses formatted with `["` addr `"]`
    printf "  %s [\"%s\"]\n", $1, abc ;
    next
 }

# print any other lines with no editing.
{ print }

提供更新文件的输出，如下所示。请注意，内置变量 RS（记录分隔符）正在文件之间更新，以单独处理每个文件。

~$ ./log_edit RS='[' hosts RS='\n' logstash
output.logstash:
  # The Logstash hosts
   hosts: ["192.168.29.153", "192.168.29.155"]

  # Optional SSL. By default is off.
  # List of root certificates for HTTPS server verifications
  #ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]

  # Certificate for SSL client authentication
  #ssl.certificate: "/etc/pki/client/cert.pem

您还需要保存输出然后替换旧文件。

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