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Perl 4 sa
1.
Perl
2.
提纲 读写文件 变量
逻辑控制 胶水
3.
Perl的好处 生产效率高
4.
开始!Perlit! 1、创建一个it.pl文件 2、perl
it.pl perl –e “print ‘hello,world’”
5.
Perl的奇妙变量 $_ @_
6.
读写文件
7.
Perl 读文件 open
$fh,’<’,’/etc/passwd’; while(<$fh>){print $_;}
8.
Perl写文件 open$fh,”>”,”123.txt”; print
$fh “write it down.”;
9.
变量
10.
标量$ 数组@ 哈希%
11.
标量 scalar my
$string = ‘曾文杰’; my $number = 5143;
12.
数组 array my
@person = (‘曾文杰’,’唐骏’,’张阳’); my @code = (5143,250,5145);
13.
哈希 hash %person
= ( “5143” => “曾文杰", “250” => “唐骏", “5145” => “张阳", );
14.
逻辑控制
15.
if if ($name
eq “张阳") { print “welcome"; } else { print “get out”;} if ($age == 60) { print “oldman"; }
16.
while while($foo <
100) { print $foo++;}
17.
for for($i=1;$i<100;$i++) {print
$_;} for(1..99) {print $_;}
18.
foreach foreach my
$person (‘超人’, ’钢铁侠’, ’闪电侠’) {print $person;}
19.
更多控制 google 循序渐进、按需索求
20.
胶水语言
21.
DBI
22.
system(“ls”); `ls`;
23.
替代awk和sed
24.
sed perl -pi
-e 's/aaa/bbb/' filename
25.
awk perl -lane
'print $F[0] + $F[-2]'
26.
更多内容 子函数、模块 OOP
正则表达式 程序打包 CPAN
27.
进一步学习 perldoc 《Perl语言入门》
28.
拜谁所赐? LarryWall CPANAuthors
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