在新shell中运行一个echo命令并回传该shell的pid。
Run an echo command in a new shell and echo that shell's pid.
无线数据通讯系统采用SA68D11无线数传模块接收来自地面系统的命令，并向地面系统发送机车状态参数。
The former receives the orders from wayside system by radio data module SA68D11 and delivers locomotive's state informations to wayside system;
振动数据采集系统利用—对无线数传模块取代电缆线，实现了数据采集卡与上位机之间命令和数据信号的无线传输。
Wireless transmission between the data acquisition card and the upper computer is realized through the substitution of a couple of wireless data transmission modules for cables.
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