perl 打开和关闭文件

 #!/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);