Two options:
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users
davidq root tomcat6
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w
12:51:40 up 3 days, 20:49, 3 users, load average: 0.00, 0.05, 0.08
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/0 10.129.42.213 12:51 0.00s 0.02s 0.00s w
davidq pts/1 172.29.255.151 11:43 48:14 1:13 0.03s bash
tomcat6 pts/2 172.29.255.151 11:50 39:28 0.07s 0.06s bash