1. ps aux
If you are looking for a short summary of the active processes, use ps aux
[root@rhel7 tmp]# ps aux |head USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.3 44496 7124 ? Ss Jun27 0:01 /usr/lib/systemd/systemd --switched-root --system --deserialize 21 root 2 0.0 0.0 0 0 ? S Jun27 0:00 [kthreadd] root 3 0.0 0.0 0 0 ? S Jun27 0:00 [ksoftirqd/0] root 7 0.0 0.0 0 0 ? S Jun27 0:00 [migration/0] root 8 0.0 0.0 0 0 ? S Jun27 0:00 [rcu_bh] root 9 0.0 0.0 0 0 ? S Jun27 0:00 [rcuob/0] root 10 0.0 0.0 0 0 ? R Jun27 0:00 [rcu_sched] root 11 0.0 0.0 0 0 ? S Jun27 0:00 [rcuos/0] root 12 0.0 0.0 0 0 ? S Jun27 0:00 [watchdog/0]
2. ps -ef
If you are not only looking for the name of the process but also for the exact command that was used to start the process, use ps -ef .
[root@rhel7 tmp]# ps -ef |head UID PID PPID C STIME TTY TIME CMD root 1 0 0 Jun27 ? 00:00:01 /usr/lib/systemd/systemd --switched-root --system --deserialize 21 root 2 0 0 Jun27 ? 00:00:00 [kthreadd] root 3 2 0 Jun27 ? 00:00:00 [ksoftirqd/0] root 7 2 0 Jun27 ? 00:00:00 [migration/0] root 8 2 0 Jun27 ? 00:00:00 [rcu_bh] root 9 2 0 Jun27 ? 00:00:00 [rcuob/0] root 10 2 0 Jun27 ? 00:00:00 [rcu_sched] root 11 2 0 Jun27 ? 00:00:00 [rcuos/0] root 12 2 0 Jun27 ? 00:00:00 [watchdog/0]
3.ps fax
which shows hierarchical relationships between parent and child processes.
[root@rhel7 tmp]# ps fax | head PID TTY STAT TIME COMMAND 2 ? S 0:00 [kthreadd] 3 ? S 0:00 \_ [ksoftirqd/0] 7 ? S 0:00 \_ [migration/0] 8 ? S 0:00 \_ [rcu_bh] 9 ? S 0:00 \_ [rcuob/0] 10 ? R 0:00 \_ [rcu_sched] 11 ? S 0:00 \_ [rcuos/0] 12 ? S 0:00 \_ [watchdog/0] 13 ? S< 0:00 \_ [khelper]