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;