ps - Report a snapshot of the current processes

Edit online
The ps command gives comprehensive statistics data on process level and reports a snapshot of the current processes.
See the ps man page for the complete syntax and all options.

Example

Use ps uax to get top processes :
# ps uax | head
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root           1  0.0  0.3 169352 13124 ?        Ss   Apr23   0:56 /usr/lib/systemd/systemd --switched-root --system --deserialize 17
root           2  0.0  0.0      0     0 ?        S    Apr23   0:02 [kthreadd]
root           3  0.0  0.0      0     0 ?        I<   Apr23   0:00 [rcu_gp]
root           4  0.0  0.0      0     0 ?        I<   Apr23   0:00 [rcu_par_gp]
root           5  0.0  0.0      0     0 ?        I<   Apr23   0:00 [slub_flushwq]
root           7  0.0  0.0      0     0 ?        I<   Apr23   0:00 [kworker/0:0H-events_highpri]
root          10  0.0  0.0      0     0 ?        I<   Apr23   0:00 [mm_percpu_wq]
root          11  0.0  0.0      0     0 ?        S    Apr23   0:00 [rcu_tasks_rude_]
root          12  0.0  0.0      0     0 ?        S    Apr23   0:00 [rcu_tasks_trace]