Process tabular BLAST output

Dear all,

Iam struggling with processing tabular BLAST output. I would like to do the following:

Take a Blast output table (simplified):

Sequence ID | e-value | GI

Seq1    0.001   12345

Seq1    0.001   34567

Seq1    0.001   478910

Seq2    ...         

and convert it into something like that:

Sequence ID | GIs

Seq1    12345   34567   478910

Seq2    ...

Any ideas are welcome, iam sure i can figure it out myself but right now i have a hard time

to figure out a solution.