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If you read User input like that, you must know, that the linebreak will also be stored in your variable. So you must remove it; see chomp for details.
chomp( my $dir = <STDIN> );
Each statement should be completed with a ';', your chdir misses one.
You should check if chdir was successful and do something if it wasn't ($! contains the system's error message).
chdir( $dir ) or die "$dir: $!\n";
If you already changed into $dir, you must not specify it again in the glob pattern.
As you are using strict, you need to declare each new variable. You did it right with $dir, but not with @files.
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