base64명령어 사용법

 

□ base64 명령어  decoding, encoding 

## cat으로 certificate file 보면, decoding 된 data 확인

[node2 pki]$ cat front-proxy-ca.crt
-----BEGIN CERTIFICATE-----
MIIC7zCCAdegAwIBAgIBADANBgkqhkiG9w0BAQsFADAZMRcwFQYDVQQDEw5mcm9u
<중략>
-----END CERTIFICATE-----


## base64 실행하게되면 encoding된 data 확인
[node2 pki]$ cat front-proxy-ca.crt | base64
LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUM3ekNDQWRlZ0F3SUJBZ0lCQURBTkJna3Fo
<중략>

 

□ base64  encoding data 한줄로 보기

  -w, --wrap=COLS       wrap encoded lines after COLS character (default 76).
                          Use 0 to disable line wrapping

위 내용 이해하려면 복잡하니깐,  "base64 -w 0" 쓰면 한줄로 나온다.

ex)  "base64 -w 0" 

##  base64 default명령어를 사용하면, 여러줄로 출력
[node2 pki]$ cat front-proxy-ca.crt | base64
LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUM3ekNDQWRlZ0F3SUJBZ0lCQURBTkJna3Fo
a2lHOXcwQkFRc0ZBREFaTVJjd0ZRWURWUVFERXc1bWNtOXUKZEMxd2NtOTRlUzFqWVRBZUZ3MHlN
<중략>


## "-w 0" 옵션을 사용하여, 여러줄로 표시될 encoding data를 한줄로 볼수 있음

[node2 pki]$ cat front-proxy-ca.crt | base64 -w 0
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