关于yum update和yum upgrade的区别
Posted 5201351
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了关于yum update和yum upgrade的区别相关的知识,希望对你有一定的参考价值。
系统环境:CentOS Linux release 7.7.1908 (Core)
网上看到,很多说关于yum update和yum upgrade的区别是,
update会升级所有包同时也升级软件和系统内核,而upgrade只升级所有包,不升级软件和系统内核
这种说法是错误的!!!!!!!!!
首页通过man yum命令看update解释如下:
update If run without any packages, update will update every currently installed package. If one or more packages or package globs are specified, Yum will only update the listed packages. While updating packages, yum will ensure that all dependencies are satisfied. (See Specifying package names for more information) If the packages or globs specified match to packages which are not currently installed then update will not install them. update operates on groups, files, provides and filelists just like the "install" com‐ mand. If the main obsoletes configure option is true (default) or the --obsoletes flag is present yum will include package obsoletes in its calculations - this makes it better for distro-version changes, for example: upgrading from somelinux 8.0 to somelinux 9. Note that "update" works on installed packages first, and only if there are no matches does it look for available packages. The difference is most noticeable when you do "update foo-1-2" which will act exactly as "update foo" if foo-1-2 is installed. You can use the "update-to" if you‘d prefer that nothing happen in the above case.
再看upgrade的说明:
upgrade Is the same as the update command with the --obsoletes flag set. See update for more details.
这里可以看出,yum upgrade 其实就是和yum update --obsoletes的效果是一样的,
而默认情况下/etc/yum.conf文件中就注明了obsoletes=1,再加之笔者也测试过,效果确实也是一样的、而且都会升级系统内核!
以上是关于关于yum update和yum upgrade的区别的主要内容,如果未能解决你的问题,请参考以下文章
Linux yum upgrade和yum update区别
Linux升级命令yum upgrade和yum update的区别
Linux升级命令yum upgrade和yum update的区别
Linux中升级更新命令yum upgrade和yum update的区别