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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);