启动后提供纯命令行界面的操作系统已逐渐演化为图形化前端。
Operating systems that once started as a command line-only interface have moved to a graphical front end.
MS-DOS是带有命令行界面的单任务处理、单用户操作系统。
MS-DOS is a single-tasking, single-user operating system with a command-line interface.
在某些情况下，你需要为习惯于命令行界面的用户设计，他们强烈希望支持键盘输入。
In some cases, you will be designing for users who are accustomed to working on command-line operating systems and the applications made for them. They will be keen to have keyboard support.
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