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CentOS yum 패키지 삭제

Yum을 삭제하는 것이 아니라, yum으로 다른 패키지를 삭제하는 것

## 설치 확인 

[root@ngio ~]# yum list installed java*jdk
... (생략)
Installed Packages
java-1.7.0-openjdk.x86_64            1:1.7.0.9-2.3.3.el5.1             installed


## 패키지 삭제

[root@ngio ~]# yum remove java-1.7.0-openjdk.x86_64
... (생략)
================================================================================
 Package                    Arch     Version                  Repository   Size
================================================================================
Removing:
 java-1.7.0-openjdk         x86_64   1:1.7.0.9-2.3.3.el5.1    installed    52 M
Removing for dependencies:
 java-1.7.0-openjdk-devel   x86_64   1:1.7.0.9-2.3.3.el5.1    installed    26 M

Transaction Summary
================================================================================
Remove        2 Package(s)
Reinstall     0 Package(s)
Downgrade     0 Package(s)

Is this ok [y/N]: y


## 재확인

[root@ngio ~]# yum list installed java*jdk
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Error: No matching Packages to list

CentOS에서 Python 버전 변경

hippogrammer.tistory.com/m/170

# python -V
# which python

# ls -al /usr/bin/python

# ls /usr/bin | grep python

# yum install python3 

-- CentOS에 여러 버전의 파이썬이 설치되어있는 것을 확인할 수 있다. 
# ls /bin | grep python


-- Update-alternatives로 파이썬 버전 등록 및 변경

# update-alternatives --config python


# update-alternatives --install /bin/python python /bin/python2.7 1
# update-alternatives --install /bin/python python /bin/python3.6 2

# update-alternatives --config python

# ls -al /bin/python
# python -V

# yum update

# vim /usr/bin/yum
내용 : #!/usr/bin/python2

# vim /usr/libexec/urlgrabber-ext-down
내용 : #!/usr/bin/python2


# yum update


# yum install python3-dev

http://www.centos.org/

http://mirror.teklinks.com/centos/6.3/isos/x86_64/

가상머신 : https://www.virtualbox.org/

https://www.virtualbox.org/wiki/Downloads

리눅스 배포판 다운로드

http://iso.linuxquestions.org/

CentOS : http://ftp.neowiz.com/centos/