Linux is a birth in the network, grew up in the network and the maturity of the...

写一个脚本文件checkuser,该脚本运行时带一个用户名作为参数，具体要求如下： 1)如果命令行格式不符合要求，应有错误提示信息； 2)在/etc/passwd文件中查找是否有该用户， 如有，则输出“Found in the /etc/passwd file.” 否则，输出“No such on our system” -Write a script file checkuser, the script run-time with a user name as a parameter, and specific requirements are as follows: 1) If the command-line format does not meet the requirements, there should be error message 2) in/etc/passwd file to check if there were any users, and if so, then the output " Found in the/etc/passwd file. " Otherwise, output" No such on our system "

Linux 默认情况下，PC 喇叭发出的嘟嘟声音警告（System Beep）. 本程序可以让你随意控制蜂鸣器-Linux by default, PC speaker voice warning issued toot (System Beep). This procedure allows you to manipulate the buzzer

基于tcp的文件下载程序，能下载网络上的资源-Tcp-based file download process, be able to download the resources on the network

linux下的串口通讯-of serial communications

Linux设备驱动程序(中文第三版) 2.6内核-Linux Devices Driver 2.6 kernel

用qt实现文字滚动功能，文字超过设定的长度可自动从左至右不断滚动-Qt achieved with scrolling text function, the length of the text exceeds a set automatically roll over from left to right

在linux下简易的播放器，可以用来测试.yuv文件-In summary, under linux player that can be used to test. Yuv file

LINUX下DM9000移植分析，并对LINUX下的PLATFORM_DEVICE和PLATFORM_DIRVER也讲得很透彻-LINUX under the DM9000 transplant analysis, as well as LINUX under PLATFORM_DEVICE and PLATFORM_DIRVER also spoke very thorough

一个在LINUX下运行的shell程序，实现了命令运行，I/O重定向和环境变量处理等功能。-a LINUX operating in the shell and realized the running order, I/O redirection and environmental variables as well.

mosquiteo mobile iP 4 the handover program