Perl 清空文件c1

<pre name="code" class="sql">jrhapt01:/home/tomcat/mon> cat c1.pl 
my $tom_home='/usr/local/apache-tomcat-7.0.55_8081/webapps/mon';
if (-f "$tom_home/file.html"){
open FILE,">$tom_home/file.html";
close FILE;}