Perl学习笔记之文件操作

perl对文件的操作，跟其它的语言类似，无非也就是打开，读与写的操作。
1. 打开文件

#! c:/perl/bin/perl -w 
use utf8; 
use strict; 
use warnings; 
 
my $filename = 'test.txt'; # 或者用绝对路径,如: c:/perl/learn/test.txt 
 
if(open(myfile,$filename)) # myfile是一个标志 
{ 
 printf "can open this file:%s!", $filename;  
 close(myfile); 
} 
else{ 
 print "can't open this file!"; 
} 

2. 读取文件

#! c:/perl/bin/perl -w 
use utf8; 
use strict; 
use warnings; 
 
my $filename = 'test.txt';  
if(open(myfile,$filename)) 
{ 
 my @myfile = <myfile>;  #如果要读取多行，用此方法，如果只读取一行为:$myfile = <>; 
 my $count = 0;     #要读取的行数，初始值为0     
 printf "i have opened this file: %s\n", $filename; 
 while($count < @myfile){ #遍历 
  print ("$myfile[$count]\n"); #注意此种写法. 
  $count++; 
 } 
 close(myfile); 
} 
else{ 
 print "i can't open this file!"; 
} 
exit; 

3. 写入文件

#! c:/perl/bin/perl -w 
use utf8; 
use strict; 
use warnings; 
 
my $filename = 'test.txt';  
 
if(open(myfile,">>".$filename))  #此种写发，添加不删除 
{                 #此种写法，重写文件内容 myfile,">".$filename 
 print myfile "write file appending test\n"; 
 close(myfile); 
} 
else{ 
 print "i can't open this file!"; 
} 
exit;