Sort file based on column

Hi,

My input file is

$cat samp
1 siva
1 raja
2 siva
1 siva
2 raja
4 venkat

i want sort this name wise...alos need to remove duplicate lines.

i am using

cat samp|awk '{print $2,$1}'|sort -u

it showing

raja 1
raja 2
siva 1
siva 2
venkat 4

but i want the below output

raja 1
siva 1
venkat 4

Please help me....

$ awk '{print $2,$1}' samp | sort -uk1,1
raja 1
siva 1
venkat 4

Hi

  cat samp | awk '{print $2,$1}' | sort -u -k 1,1

Guru

many thanks....