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Check active users

top gives you information about active users on a linux server system.

Example

top - 13:13:29 up 167 days, 21:45,  5 users,  load average: 3.98, 4.28, 4.05
Threads: 40110 total,   4 running, 40104 sleeping,   0 stopped,   2 zombie
%Cpu(s):  3.7 us,  1.6 sy,  0.1 ni, 94.4 id,  0.0 wa,  0.0 hi,  0.1 si,  0.0 st
KiB Mem : 13112041+total,  8070096 free, 64865496 used, 58184820 buff/cache
KiB Swap:  4194300 total,  4139660 free,    54640 used. 65108580 avail Mem

Above information has a total of 5 users.

The command w displays information about the users currently on the machine, and their processes. The header shows, in this order, the current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

Example: Another user has logged in.

lemapper@theta:~/> w
 13:15:10 up 167 days, 21:46,  6 users,  load average: 4.55, 4.23, 4.04
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
user1    pts/0    10.16.29.65      11:02    2:10m  0.04s  0.01s sshd: user1 [priv]
tan      pts/3    10.51.192.109    08:56    6.00s  0.25s  0.02s sshd: tan   [priv]
user3    pts/8    10.51.192.176    Fri11    4days  0.79s  0.00s sshd: user3 [priv]
user6    pts/9    10.43.19.69      11:55    1:16m  0.07s  0.02s sshd: user6 [priv]
user4    pts/15   10.43.18.176     13:13   54.00s  0.08s  0.01s sshd: user4 [priv]
user5    pts/17   10.51.193.125    12:53   18:06   0.08s  0.01s sshd: user5 [priv]

Check only for specific user

lemapper@theta:~/> w tknga
 13:15:22 up 167 days, 21:47,  6 users,  load average: 5.95, 4.53, 4.14
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
tan      pts/3    10.51.192.109    08:56    2.00s  0.28s  0.02s sshd: tan   [priv]

Users gives alphabetically sorted list

lemapper@theta:~/> users
tan user1 user3 user4 user5 user6