or download this
$ perlcritic your-script.pl
Loop iterator is not lexical at line 13, column 1. See page 108 of PB
+P. (Severity: 5)
Bareword file handle opened at line 15, column 1. See pages 202,204 o
+f PBP. (Severity: 5)
Two-argument "open" used at line 15, column 1. See page 207 of PBP.
+(Severity: 5)