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
useutf8;
usestrict;
usewarnings;
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"Canopenthisfile:%s!",$filename;
close(MYFILE);
}
else{
print"Can'topenthisfile!";
}
2.读取文件
#!c:/perl/bin/perl-w
useutf8;
usestrict;
usewarnings;
my$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$count=0;#要读取的行数，初始值为0
printf"Ihaveopenedthisfile:%s\n",$filename;
while($count<@myfile){#遍历
print("$myfile[$count]\n");#注意此种写法.
$count++;
}
close(MYFILE);
}
else{
print"Ican'topenthisfile!";
}
exit;
3.写入文件
#!c:/perl/bin/perl-w
useutf8;
usestrict;
usewarnings;
my$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
printMYFILE"WriteFileappendingTest\n";
close(MYFILE);
}
else{
print"Ican'topenthisfile!";
}
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