Perl by Example(4th Edition)读书笔记-1.Perl介绍

Perl by Example(4th Edition)读书笔记-1.Perl介绍

Perl--Practical Extraction and Report Language（实际提取和报告语言）
1.1 What Is Perl?
"Laziness, impatience, and hubris. Great Perl programmers embrace those virtues."
—Larry Wall
Perl是开源的解释语言。Perl最初用于Unix,但现在已经发展成为一种跨平台的语言。Perl脚本相似于Unix的awk,sed，Shell脚本和C语言。
1.2What Is an Interpreted Language?
Perl程序需要文本编辑器和Perl解释器。Perl是在运行时解析和执行的，而不是先被编译成二进制的形式，然后再运行。
1.3. Who Uses Perl?
任何人都可以使用Perl
1.4. Where to Get Perl
(1)官方Perl: www.perl.com
(2)Perl Directory: www.perl.org
(3)Perl Archive Network: http://www.cpan.org/
(4)Perl开发基础： http://www.activestate.com/
1.5. What Is CPAN?
CPAN指的是Comprehensive Perl Archive Network。其中保存着所有免费的Perl资料。
www.perl.com/CPAN
www.cpan.org
1.6. Perl Documentation
man perl
如果你想找到指定的模块如何工作，可以使用perldoc. 例如 perldoc CGI
如果想得到指定Perl函数的的文档，可以使用perldox -f.例如 perldoc -f localtime
1.7. What You Should Know
1. Who wrote Perl?
2. What does Perl stand for?
3. What is the meaning of "open source"?
4. What is the current release?
5. What is Perl used for?
6. What is an interpreter?
7. Where can you get Perl?
8. What is ActivePerl?
9. What is CPAN?
10. Where do you get documentation?
11. How would you find documentation for a specific Perl function?