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!/usr/bin/perl -w
use strict;
#print "please input a string\n";
#my $line = <STDIN>;
#print $line;
#wirte a file
open(FH, ">aa.txt") or die $!;
print FH "hello\n";#向文件写入内容
print FH "OK\n";
close(FH);
#open a file
open(FH, "aa.txt") or die $!;
my @f = <FH>;#将文件内容读出
print @f;
close(FH);
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