Perl借取了C、sed、awk、shell scr ipting以及很多其他程序语言的特性。其中最重要的特性是它内部集成了正则表达式的功能，以及巨大的第三方代码库CPAN。简而言之，Perl象C一样强大，象awk、sed等脚本描述语言一样方便。-Perl borrows the C, sed, awk, shell scr ipting, and many other programming language features. One of the most important featur

Everything evolves. There are no exceptions, even for shell code.First the code was hidden using encryption. Now, it mimics the host data file. This paper discusses the evolution thus far, and though impossible to know for certain, the probable futur

shell命令解释器的源码，实现内部外部命令及管道重定向等-shell command interpreter source code, to achieve internal and external commands and pipes and redirection

this the code to show how to use the shell and system ca-this is the code to show how to use the shell and system call