CentOS 中 yum update 与 yum upgrade 的区别

10-12-23 12:31 24256 0 技术

在 CentOS 系统中，yum upgrade 与 yum update 都会将系统包更新到最新版本。

通过 man yum 查询到的帮助信息如下：

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  oper-
ates on groups, files, provides and filelists just like the "install" command.

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.

upgrade

Is the same as the update command with the --obsoletes flag set. See update for more details.

唯一不同是：yum upgrade 会删除旧版本的 package，而 yum update 则会保留。注意！如果你的某些软件依赖旧版本的 package，请使用 yum update。

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