1 请用perl在屏幕输出hello,world
[root@localhost perl]# cat perlhello.pl #!/usr/bin/perl print "hello,world!\n"; [root@localhost perl]# ./perlhello.pl hello,world!
2 截取出正则的匹配内容，在shell中，真是头都大了
#!/usr/bin/perl -w
$_="<span class=\"title\">Counter-Strike Global Ofensive</span>";
if(/<span class=\"title\">(.*)<\/span>/)
{
print "$1\n";
}[root@localhost perl]# ./perlre.pl Counter-Strike Global Ofensive
稍微改动下，截取括号的内容，也是很简单
#!/usr/bin/perl -w
#注意每一句以分号结尾，注意是否转义
$_="(Counter-Strike Global Ofensive)";
if(/\((.*)\)/)
{
print "$1\n";
}3 接受标准输入，并输出
#!/usr/bin/perl -w
while (<>)
{print;}[root@localhost perl]# ./receive.pl
hello,i am liuliancao
hello,i am liuliancao
4 计算圆的面积
#!/usr/bin/perl -w
print "please input the radius of the circle";
$r=<STDIN>;
if($r lt 0)
{$c=0;}
else
{$c=2*$r*3.141592654;}
print "the c is $c\n";[root@localhost perl]# ./circle.pl please input the radius of the circle:1 the c is 6.283185308
5 计算两个数的乘积，并输出它们
#!/usr/bin/perl -w print "please input two number divided by Enter,and i will mutiply them\n"; chomp($a=<STDIN>); $b=<STDIN>; print "a is $a, and b is $b and the muti result is ",$a*$b," !\n";
[root@localhost perl]# ./muti.pl
please input two number divided by Enter,and i will mutiply them
2
5
a is 2, and b is 5
and the muti result is 10 !
6 重复输出指定次数字符串
#!/usr/bin/perl -w print "please input string and times divided by Enter!\n"; chomp ($a=<STDIN>); $b=<STDIN>; $result=$a x $b; print "result is $result\n";
[root@localhost perl]# ./stringtimes.pl please input string and times divided by Enter! liuliancao 5 result is liuliancaoliuliancaoliuliancaoliuliancaoliuliancao
