Shulou(Shulou.com)06/02 Report--

1.yum [option] [query work items] [related parameters]

Options and parameters:

[option]: the main options include:

-y: when yum waits for user input, this option automatically provides a response from yes

-- installroot=/some/path: install the software on / some/path instead of using the default path

[query work items] [related parameters]: the parameters in this area are:

Search: search for important keywords for a software name or description (description)

List: lists all the software names and versions currently managed by yum, somewhat similar to rpm-qa

Info: same as above, but somewhat similar to the execution result of rpm-qai

Provides: search for software from files! Similar to rpm-qf function!

Yum [option] [work items for installation, upgrade and uninstallation] [related parameters]

Options and parameters:

Install: followed by the software to be installed!

Update: this is followed by the software to be upgraded. If you want to upgrade the whole system, you can simply update it.

Remove: followed by the software to be uninstalled

Yum [group function] [software group]

Options and parameters:

Grouplist: lists all available "software groups", such as Development Tools

Groupinfo: followed by group_name, you can learn all the software names contained in the group

Groupinstall: this works! Can install a whole group of software groups, quite good to use!

Groupremove: remove a software group

4. Change the yum source:

1. Open the yum folder of centos

Cd / etc/yum.repos.d/

Download repo file with wget

Wget http://mirrors.aliyun.com/repo/Centos-7.repo

two。 If the wget command does not take effect, the wget tool has not been installed. Enter yum-y install wget to install it.

The current directory is / etc/yum.repos.d/,. The Centos-7.repo you just downloaded is also on this directory.

3. Back up the original repo file of the system

Mv CentOs-Base.repo CentOs-Base.repo.bak (that is, rename CentOs-Base.repo-> CentOs-Base.repo.bak)

4. Replace the repo file of the system principle

Mv Centos-7.repo CentOs-Base.repo (that is, rename Centos-7.repo-> CentOs-Base.repo)

5. Execute the yum source update command

Yum clean all

Yum makecache

Yum update

Execute the above three commands in turn to complete the configuration.

5. Modify the software library:

[base]: represents the name of the software library! Square brackets must exist, and the name inside can be taken at will. But you cannot have two identical software library names.

Otherwise, yum will not know where to find the software list files related to the software library.

Name: just to explain the significance of this software library, the importance is not high!

Mirrorlist=: lists the mapping sites that can be used by this software library. If you don't want to use them, you can annotate this line.

Baseurl=: is the most important, because what follows is the actual URL of the software library! Mirrorlist is captured by the yum program on its own.

Baseurl is to specify a fixed software library URL!

Enable=1: just let the software library be started. If you don't want to start, you can use enable=0!

Gpgcheck=1: do you remember RPM's digital signature? This is to specify whether you need to consult the digital signature in the RPM file!

Gpgkey=: is the location of the digitally signed public key file! Just use the default value.

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