用来测试输入的是数字还是字符串

Linux下的声音设备编程比大多数人想象的要简单得多。一般说来，我们常用的声音设备是内部扬声器和声卡，它们都对应/dev目录下的一个或多个设备文件，我们象打开普通文件一样打开它们，用ioctl（）函数设置一些参数，然后对这些打开的特殊文件进写操作。-Linux Generally speaking, we used the voices of internal equipment and audio speakers, which corresponds to/dev directory of one or more equipment, we like to open the file as they opened with ioctl () function set some parameters, then open these documents into the special write .

Linux 命令全集－－本手册共收录了366个命令，注释详尽是你学习linux的好帮手！-Linux command Collection- This manual contains a total of 366 commands, comments in detail you learn linux is a good helper!

condor并行编程-Condor Parallel Programming

可在嵌入式uclinux操作系统下的ARM7板子上跑的网络摄像机程序.-Can be embedded uClinux operating system running on the ARM7 board process of network cameras.

Perl 脚本程序 文本计数器 运行环境 linux-Perl script text counter Linux operating environment

一个可以用来打印任何一个月所有天数的SHELL脚本-1 can be used to print all the days in any month the number of Shell scripts

主要是网络上传输t38传真的程序，介绍传真的包的程序-mainly on the transmission network fax t38 procedures introduced by fax packet procedure

linux下的串口精灵的类似软件，为嵌入式软件开发人员提供一个在linux下的串口调试的工具-linux serial port under the Wizard of similar software for embedded software developers to provide a serial port under linux debugging tools

linux线程编程-linux multi-thread programming

homework , operating system, on shared memory