Shell Programming and Scripting

      if ( unlink("$opt_b") == 1 ) {
            print_log( "$opt_b deleted", 1 );
        }else {
            print_log( "Could not delete $opt_b:$!", 1 );
        }

 
echo "" > file_name

my $trunc_ok = 1;
open my $FH, '>', $opt_b or $trunc_ok = 0;
close $FH;
if ( $trunc_ok ) {
    print_log( "$opt_b truncated", 1 );
} else {
    print_log( "Could not truncate $opt_b:$!", 1 );
}

mute@geek:~/test$ echo >null; ls -l null; echo -n >null; ls -l null
-rw-r--r-- 1 mute mute 1 Jun 22 04:24 null
-rw-r--r-- 1 mute mute 0 Jun 22 04:24 null