How to check whether mysql is installed on linux

How to check whether mysql is installed on Linux: 1. Open the terminal command window; 2. Execute the command "service mysqld start" or "chkconfig --list mysqld" command.

The operating environment of this article: linux5.9.8 system, mysql5.5, DELL G3 computer

How to check whether mysql is installed on linux ?

linux Check whether MySQL is installed:

yum install mysql

yum -y install mysql-server

1, the daemon process of mysql is mysqld

If it has been installed:

[root@localhost ~]# service mysqld start
启动 MySQL：                                               [确定]

If it has not been installed:

[root@localhost ~]# service mysqld start
mysqld:未被识别的服务

You can see if your service has been added to linux

[root@localhost ~]# chkconfig --list mysqld
mysqld          0:关闭  1:关闭  2:关闭  3:关闭  4:关闭  5:启用  6:关闭

If it has not been installed:

[root@localhost ~]# chkconfig --list mysqld

An error occurred while reading information in the mysqld service. There is no such file or directory

Once you start the service, you can check whether the server is running like this

[root@localhost ~]# ps -el | grep mysqld
4 S     0  1796     1  0  85   0 -  1513 wait   ?        00:00:00 mysqld_safe 
4 S    27  1856  1796  0  78   0 - 34055 -      ?        00:00:00 mysqld 
[root@localhost ~]#

If you If you see it, it means that the server is installed~~

Check whether apache is installed and its version under Linux

If Tong is installed through the rpm package, use the following directly Command:

rpm -q httpd

You can also use the following two methods:

httpd   -v  
apachectl   -v

Uninstall mysql method under linux Uninstall mysql under linux

a. Find the installed myslq version:

   #rpm  -qa | grep  mysql （注意大小写，如果mysql 不行就换MySQL）

Display:

[root@localhost ~]# rpm  -qa | grep  mysql
mysql-5.0.77-4.el5_4.2 
mysql-server-5.0.77-4.el5_4.2 
php-mysql-5.2.13-1.el5.art

The installed mysql package name will be displayed on the screen, such as: mysql-5.0.77-4.el5_4.2;

The searched out Uninstall package name:

#rpm -e  –nodeps mysql-5.0.77-4.el5_4.2  （nodeps表示强制删除）

Tips

error: package –nodeps is not installed 
error: package mysql-.0.77-4.e15_.2 is not installed

Linux view mysql installation path

1. View file installation path

Due to software There is more than one installation place, so let’s first check all the paths (addresses) of the file installation.

Here is mysql as an example. For example, I installed mysql, but I don’t know where the files are installed or in which folders. You can use the following command to view all file paths

Enter in the terminal:

whereis mysql

Enter, if you have installed mysql, the address of the file installation will be displayed, such as my display (the installation address may be different)

[root@localhost ~]# whereis mysql 
mysql: /usr/bin/mysql /usr/lib/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz

2. Query the path of the running file (folder address)

If you only want to query the address of the running file of the file, just use the following command (still use mysql as an example):

which mysql

Terminal display:

[root@localhost ~]# which mysql 
/usr/bin/mysql

Recommended Study: "mysql video tutorial"

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