What is the difference between the upgrade update command yum upgrade and yum update in Linux

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There are two Linux upgrade commands, yum upgrade and yum update, which are different:

The code is as follows:

Yum-y update

Upgrade all packages as well as software and system kernels

The code is as follows:

Yum-y upgrade

Upgrade only all packages, not software and system kernel

Yum-y upgrade and yum-y update are tested in the experiment.

Before upgrad

System version: centos5.5

Kernel version: 2.6.18-194.el5

Simple profile modifications were made before upgrade

After yum-y upgrade upgrade

System version: centos5.7

Kernel version: 2.6.18-194.el5

After yum-y update upgrade

System version: centos5.7

Kernel version: 2.6.18-238.el5

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