C:\Code>perl unique.pl --help
Usage:
     unique.pl [options]
     Options:
            --help          Brief help message
            --man           Full documentation
            --first         Keep the first one found rather than the last.


C:\Code>perl unique.pl
30F-WKS `1781183799.xxx11' IC---
ADM34A3F9 `1781183799.41455' IC---

C:\Code>perl unique.pl --first
30F-WKS `1781183799.xxxx1' IC---
ADM34A3F9 `1781183799.41455' IC---