Mercurial's primary command is hg, which supports a set of sub-commands that are similar to those in other VCS systems.
Mercurial的主要命令是hg,它支持与其他VCS系统相似的一套子命令。
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The industry control system often need connect several control sub systems, which use one main device, for example PC, to send commands and get data, and is connected to become a special network.
Though the interface, commands of sub-closing control and system configuration can be sent while various status information of the system can be obtained at the same time.