Redhat下的alternatives命令和机制

Redhat最早在7.3的release时从Debian等系统那里引入了alternatives机制，以实现多软件包对应同一应用、服务的需要。

  • Red Hat Linux 现在包括了一个 Debian 另选系统的端口，
    作为一种支持提供某项服务的多种软件包的途径。
    每一个在多种软件包内通用的二进制程序/文件都被
    换成了一个到 /etc 的符号链接；然后
    它将会被解析到该文件的不同选择。例如：
    /usr/sbin/sendmail -> /etc/alternatives/mta ->
    /usr/sbin/sendmail.sendmail
    这些符号链接是由
    /usr/sbin/alternatives 来添加和管理的。详情请参阅 man 8
    alternatives    。
    目前，Red Hat Linux 提供 Sendmail 和 Postfix 这两种邮件传输代理
    （MTA）。关于打印守护进程的选项，可选的是 LPRng 和 CUPS。
    请注意，LPRng 和 CUPS 的配置是完全分开的。如果你从一种
    打印系统切换到另一种，你将必须重新配置你的打印机。与之类似，
    postfix 和 sendmail 也有各自分开的配置文件。

  • 最新的Redhat中中文输入法的设置也使用了alternatives机制，/etc/alternatives/zh_CN就是相关的应用。

  • 主页alternatives


  • Redhat alternatives 命令使用
    --set
    --auto
    --display
    --config
    --remove
    --install

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