There's nothing about that line of code that works. The stat call is broken by the lack of quotes around /dir/filename. Then the rest is broken because stat() doesn't return an object, it returns an array. And even if it did return an object, the method calls wouldn't work because they're in the middle of a quoted string!
Here's a version that works:
perl -le '@pv=stat("/dir/filename"); printf "%d,%d,%04o", $pv[4],$pv[5],$pv[2] & 07777;'
The mode stuff is tricky - I took that bit-mask and format stuff from stat.
-sam
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