linux - 使用 awk 提取 key 的 BASH 脚本

Question

我正在创建 dkim 私钥和公钥openssl genrsa -out dkim1024.key 1024openssl rsa -in dkim1024.key -out dkim1024.pub -pubout -outform PEM

我有一个使用 awk 提取 key 文件的 bash 脚本键= /usr/bin/awk 'NR>1{a[++k]=$0}END{for(i=1;i<k;i++)print a[i]}' file.key

file.key 内容

-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqasdfadaBAQUAA4GNADCBiQKBsdfadsfsDgrKE5D2atbGtaqVmAZwzy1YNY
8pUYgF6qQ4zecRrpk3Uam52asdfafasdasdfasgwYAA0x3roKIYAeHFFrFm9aCS
WKpM+na/03akmpewn4cjT4sm9qTHP0q/VM/YtHy3rGkPj+xzOKgO9rzyZo3E1a1O
HYu6TIqqzlqtadfafafafdas
-----END PUBLIC KEY-----

我需要删除线条。-----开始公钥----------结束公钥-----我已经在我的 awk cmd 中完成了这个但是当我回显 $KEY 时有空格。我猜这些是返回字符，但我不确定如何摆脱它们但保留 key 。

sh-3.2# echo $KEY
MIGfMA0GCSqasdfadaBAQUAA4GNADCBiQKBsdfadsfsDgrKE5D2atbGtaqVmAZwzy1YNY 8pUYgF6qQ4zecRrpk3Uam52asdfafasdasdfasgwYAA0x3roKIYAeHFFrFm9aCS WKpM+na/03akmpewn4cjT4sm9qTHP0q/VM/YtHy3rGkPj+xzOKgO9rzyZo3E1a1O HYu6TIqqzlqtadfafafafdas

谢谢

Answer 1

由于 word splitting，您得到的是空格而不是行.你应该用双引号引用你的变量

echo "$KEY"

这也可能是另一种解决方案:

awk '/-END PUBLIC KEY-/ { p = 0 }; p; /-BEGIN PUBLIC KEY-/ { p = 1 }' file.key

输出:

MIGfMA0GCSqasdfadaBAQUAA4GNADCBiQKBsdfadsfsDgrKE5D2atbGtaqVmAZwzy1YNY
8pUYgF6qQ4zecRrpk3Uam52asdfafasdasdfasgwYAA0x3roKIYAeHFFrFm9aCS
WKpM+na/03akmpewn4cjT4sm9qTHP0q/VM/YtHy3rGkPj+xzOKgO9rzyZo3E1a1O
HYu6TIqqzlqtadfafafafdas

即使在该 block 之前或之后还有其他行，该解决方案也适用。

你也可以用 Bash 本身来做:

#!/bin/bash

FILE='file.key'  ## Or FILE=$1

KEY=()
while IFS=$' \t\r\n' read -r LINE; do
    [[ $LINE == *'-END PUBLIC KEY-'* ]] && P=0
    (( P )) && KEY+=("$LINE")  ## Store every line as an array element.
    [[ $LINE == *'-BEGIN PUBLIC KEY-'* ]] && P=1
done < "$FILE"

echo --------------------

printf '%s\n' "${KEY[@]}"

echo --------------------

IFS= eval 'MERGED_KEY="${KEY[*]}"'  ## Merge key without spaces.

echo "$MERGED_KEY"

输出:

--------------------
MIGfMA0GCSqasdfadaBAQUAA4GNADCBiQKBsdfadsfsDgrKE5D2atbGtaqVmAZwzy1YNY
8pUYgF6qQ4zecRrpk3Uam52asdfafasdasdfasgwYAA0x3roKIYAeHFFrFm9aCS
WKpM+na/03akmpewn4cjT4sm9qTHP0q/VM/YtHy3rGkPj+xzOKgO9rzyZo3E1a1O
HYu6TIqqzlqtadfafafafdas
--------------------
MIGfMA0GCSqasdfadaBAQUAA4GNADCBiQKBsdfadsfsDgrKE5D2atbGtaqVmAZwzy1YNY8pUYgF6qQ4zecRrpk3Uam52asdfafasdasdfasgwYAA0x3roKIYAeHFFrFm9aCSWKpM+na/03akmpewn4cjT4sm9qTHP0q/VM/YtHy3rGkPj+xzOKgO9rzyZo3E1a1OHYu6TIqqzlqtadfafafafdas