M asks for the most recent historical command line that contains an uppercase letter m.

M寻找最近的包含大写字母M的历史命令行。

youdao

A master replicate extracts replicated table dictionary information from the master server (specified with the -m option in CDR define repl command) and stores it in the syscdr database.

主复制从主服务器(在cdr define repl命令中以- m选项指定)提取复制表的字典信息，并将之存储在syscdr数据库中。

youdao

The -m option is also used to specify the queue manager to which the command will apply.

—m选项还用于指定将应用命令的队列管理器。

youdao

And here's a little trick -- and again, we promised to point -- out little tricks of the trade -- if I know I want to execute the last command I typed that started with an m, bangm will actually figure out what that command was and redo it for me so I don't have to figure it out, or you can go back in time in a terminal window.

这里有个小技巧--此外，我们许诺指出行业中的,一些小技巧-,如果我知道我想执行我写入的上一个命令,是以m开头的，！m会明白那个命令是什么,然后为我恢复上次操作,所以我不需要明白它，或者你可以回到,那个终端窗口。

哈佛公开课 - 计算机科学课程节选