lrwxrwxrwx   root root          Jun  : pyspark -> /etc/alternatives/pyspark
lrwxrwxrwx root root Jul : python -> /usr/local/python362/bin/python3.
lrwxrwxrwx root root Oct python2 -> python
-rwxr-xr-x root root Aug python_2
-rwxr-xr-x root root Aug python2.
#!/usr/bin/python_2
import sys
try:
import yum
except ImportError:
print >> sys.stderr, """\
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was: %s Please install a package which provides this module, or
verify that the module is installed correctly. It's possible that the above module doesn't match the
current version of Python, which is:
%s If you cannot solve this problem yourself, please go to
the yum faq at:
http://yum.baseurl.org/wiki/Faq """ % (sys.exc_value, sys.version)
sys.exit(1) sys.path.insert(0, '/usr/share/yum-cli')
try:
import yummain
yummain.user_main(sys.argv[1:], exit_code=True)
except KeyboardInterrupt, e:
print >> sys.stderr, "\n\nExiting on user cancel."
sys.exit(1)
~
~
~
~
~
~
~
"/usr/bin/yum" 32L, 803C

en.wikipedia.org/wiki/Yum_(.rpm)

The Yellowdog Updater, Modified (yum) is an open-source command-line package-management utility for computers running the Linux operating system using the RPM Package Manager.[2] Though yum has a command-line interface, several other tools provide graphical user interfaces to yum functionality.

Yum allows automatic updates, package and dependency management, on RPM-based distributions.[3] Like the Advanced Package Tool (APT) from Debian, yum works with software repositories (collections of packages), which can be accessed locally[4] or over a network connection.

Under the hood, yum depends on RPM, which is a packaging standard for digital distribution of software, which automatically uses hashes and digisigs to verify the authorship and integrity of said software; unlike some app stores, which serve a similar function, neither yum nor RPM provide built-in support for proprietary restrictions on copying of packages by endusers. Yum is implemented as libraries in the Python programming language, with a small set of programs that provide a command-line interface.[5] GUI-based wrappers such as Yum Extender (yumex) also exist.[6] A rewrite of yum based on libsolv named DNF is currently being developed and replaced yum as the default package manager in Fedora 22.[7]

【学习路径】
https://dev.mysql.com/doc/refman/5.7/en/linux-installation-yum-repo.html#yum-repo-installing-mysql
【初始化】
lsb_release -d
Description: CentOS Linux release 7.3.1611 (Core)

yum update

cd usr
mkdir mysql
cd mysql

#https://dev.mysql.com/doc/refman/5.7/en/linux-installation-yum-repo.html#yum-repo-installing-mysql
#https://dev.mysql.com/downloads/repo/yum/
#mysql57-community-release-el7-11.noarch.rpm

wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
md5sum mysql57-community-release-el7-11.noarch.rpm

【安装】
sudo yum localinstall mysql57-community-release-el7-11.noarch.rpm

【版本选5.6】
cat /etc/yum.repos.d/mysql-community.repo
For example, to install MySQL 5.6, make sure you have enabled=0 for the above subrepository entry for MySQL 5.7, and have enabled=1 for the entry for the 5.6 series:
# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.6-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

【校验】
yum repolist enabled | grep "mysql.*-community.*"

【安装】
sudo yum install mysql-community-server

【启动】

sudo service mysqld start

【校验】
sudo service mysqld status

mysql -uroot -p

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