Find duplicated words in a file 2

[terrassa5]

I'm new in scripting, and I need help to create a script to find users connected twice or more times on a system.

I have a file that looks like that:

L2000 bx/bw mnt.545 L2000 22-02-2005 08:09
L2000 bx/bw nav.3675 L2000 22-02-2005 08:42
L2000 bx/bw ort.2232 L2000 22-02-2005 08:30
L2000 bx/bw osc.15224 L2000 22-02-2005 11:09
L2000 bx/bw pei.18965 L2000 22-02-2005 11:59
L2000 bx/bw pei.29141 L2000 22-02-2005 08:00
L2000 bx/bw per.29718 L2000 22-02-2005 08:04
L2000 bx/bw pos.29759 L2000 22-02-2005 08:05

Third column is the userID and process number. Columns 1 and 2 are always the same, and file is ordered by third column. I need a script that tells me which users are repeated in the file, in this case we see that user 'pei' is twice.

Could you help me with it?

Thank you very much.

 

[hoinz]

man cut
man uniq

 

[PHV]

You may try something like this:
awk '
{split($3,a,".");++u[a[1]]}
END{for(i in u)if(u>1)print i,u}
' /path/to/input

Hope This Helps, PH.
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