#! 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!"; 
} 

#! 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; 

#! 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;