How to implement linux base64 encryption and decryption

1. Base64 encode the file file and print it to the standard output

[root@pps ~]# base64 file
c25haWx3YXJyaW9yCg== 
也可以这样：
[root@pps ~]# cat file | base64
c25haWx3YXJyaW9yCg==

2. Read the file content from the standard input, base64 encode it and print it to the standard output

[root@pps ~]# base64
snailwarrior
c25haWx3YXJyaW9yCg==

3. Encode the string "snailwarrior" and print it to the standard output

[root@pps ~]# echo "snailwarrior" | base64
c25haWx3YXJyaW9yCg==

4. Base64 decoding

[root@pps ~]# echo "snailwarrior" | base64 | base64 -d
snailwarrior
base64: invalid input[root@pps ~]# echo -n "snailwarrior" | base64 | base64 -d
snailwarriorbase64: invalid input

Note:

The echo -n option does not output the '\n' newline character at the end of the string, so the exact base64 encoding of the string "snailwarrior" is "c25haWx3YXJyaW9y" , you can use PHP function to check. The "snailwarrior" string encoding in file formats, etc. all incorporates the encoding of '\n', so inexplicable encoding errors may occur accidentally.

用法：base64 [选项]... [文件]
使用 Base64 编码/解码文件或标准输入输出。

如果没有指定文件，或者文件为"-"，则从标准输入读取。

必选参数对长短选项同时适用。
  -d, --decode        解码数据
  -i, --ignore-garbag    解码时忽略非字母字符
  -w, --wrap=字符数    在指定的字符数后自动换行(默认为76)，0 为禁用自动换行

      --help        显示此帮助信息并退出
      --version        显示版本信息并退出

数据以 RFC 4648 规定的 base64 字母格式进行编码。
解码时，输入数据（编码流）可能包含一些非有效 base64 字符以及换行符。
可以尝试用 --ignore-garbage 选项来绕过编码流中的无效字符。

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