[me@host me]$ cat /tmp/data COMPUTER DISTRIBUTION_ID STATUS
30F-WKS `1781183799.xxxx1' IC---
30F-WKS `1781183799.xxx11' IC---
ADM34A3F9 `1781183799.41455' IC---
[me@host me]$ perl -ane 'print unless $seen{$F[0]}++' /tmp/data COMPUTER DISTRIBUTION_ID STATUS
30F-WKS `1781183799.xxxx1' IC---
ADM34A3F9 `1781183799.41455' IC---