I want to list all running processes. Each process should be listed with:PIDuser namegroup nameAlso, the parent/child hierarchy of the processes should be displayed.
Linux: How to show a list of running processes with PID, user, group, command line, and parent/child hierarchy?
linux
The magic combination is ps axfo pid,euser,egroup,argsHere is an output example on Ubuntu 16.04:$ ps axfo pid,euser,egroup,args  PID EUSER    EGROUP   COMMAND    2 root     root     [kthreadd]    3 root     root      \_ [ksoftirqd/0]    4 root     root      \_ [kworker/0:0]    5 root     root      \_ [kworker/0:0H]    6 root     root      \_ [kworker/u4:0]    7 root     root      \_ [rcu_sched]    8 root     root      \_ [rcu_bh]    9 root     root      \_ [migration/0]   10 root     root      \_ [watchdog/0]   11 root     root      \_ [watchdog/1]   12 root     root      \_ [migration/1]   13 root     root      \_ [ksoftirqd/1]   14 root     root      \_ [kworker/1:0]   15 root     root      \_ [kworker/1:0H]   16 root     root      \_ [kdevtmpfs]   17 root     root      \_ [netns]   18 root     root      \_ [perf]   19 root     root      \_ [khungtaskd]   20 root     root      \_ [writeback]   21 root     root      \_ [ksmd]   22 root     root      \_ [khugepaged]   23 root     root      \_ [crypto]   24 root     root      \_ [kintegrityd]   25 root     root      \_ [bioset]   26 root     root      \_ [kblockd]   27 root     root      \_ [ata_sff]   28 root     root      \_ [md]   29 root     root      \_ [devfreq_wq]   30 root     root      \_ [kworker/u4:1]   31 root     root      \_ [kworker/1:1]   32 root     root      \_ [kworker/0:1]   34 root     root      \_ [kswapd0]   35 root     root      \_ [vmstat]   36 root     root      \_ [fsnotify_mark]   37 root     root      \_ [ecryptfs-kthrea]   53 root     root      \_ [kthrotld]   54 root     root      \_ [acpi_thermal_pm]   55 root     root      \_ [bioset]   56 root     root      \_ [bioset]   57 root     root      \_ [bioset]   58 root     root      \_ [bioset]   59 root     root      \_ [bioset]   60 root     root      \_ [bioset]   61 root     root      \_ [bioset]   62 root     root      \_ [bioset]   63 root     root      \_ [bioset]   64 root     root      \_ [bioset]   65 root     root      \_ [bioset]   66 root     root      \_ [bioset]   67 root     root      \_ [bioset]   68 root     root      \_ [bioset]   69 root     root      \_ [bioset]   70 root     root      \_ [bioset]   71 root     root      \_ [bioset]   72 root     root      \_ [bioset]   73 root     root      \_ [bioset]   74 root     root      \_ [bioset]   75 root     root      \_ [bioset]   76 root     root      \_ [bioset]   77 root     root      \_ [bioset]   78 root     root      \_ [bioset]   79 root     root      \_ [scsi_eh_0]   80 root     root      \_ [scsi_tmf_0]   81 root     root      \_ [scsi_eh_1]   82 root     root      \_ [scsi_tmf_1]   83 root     root      \_ [kworker/u4:2]   87 root     root      \_ [ipv6_addrconf]   88 root     root      \_ [kworker/1:2]   89 root     root      \_ [kworker/u4:3]  102 root     root      \_ [deferwq]  103 root     root      \_ [charger_manager]  221 root     root      \_ [kpsmoused]  242 root     root      \_ [kworker/0:2]  506 root     root      \_ [mpt_poll_0]  509 root     root      \_ [mpt/0]  513 root     root      \_ [scsi_eh_2]  514 root     root      \_ [scsi_tmf_2]  515 root     root      \_ [bioset]  517 root     root      \_ [bioset]  662 root     root      \_ [raid5wq]  695 root     root      \_ [bioset]  736 root     root      \_ [jbd2/sda1-8]  737 root     root      \_ [ext4-rsv-conver]  802 root     root      \_ [iscsi_eh]  805 root     root      \_ [ib_addr]  806 root     root      \_ [ib_mcast]  807 root     root      \_ [ib_nl_sa_wq]  808 root     root      \_ [ib_cm]  809 root     root      \_ [iw_cm_wq]  810 root     root      \_ [rdma_cm]  824 root     root      \_ [kauditd] 1198 root     root      \_ [iprt-VBoxWQueue] 1778 root     root      \_ [kworker/1:1H] 1800 root     root      \_ [kworker/0:1H] 1854 root     root      \_ [kworker/1:3] 2524 root     root      \_ [kworker/0:3]    1 root     root     /sbin/init  794 root     root     /lib/systemd/systemd-journald  848 root     root     /sbin/lvmetad -f  872 root     root     /lib/systemd/systemd-udevd 1815 systemd+ systemd+ /lib/systemd/systemd-timesyncd 1836 root     root     /usr/sbin/cron -f 1838 daemon   daemon   /usr/sbin/atd -f 1840 root     root     /lib/systemd/systemd-logind 1851 root     root     /usr/sbin/acpid 1853 syslog   syslog   /usr/sbin/rsyslogd -n 1860 root     root     /usr/bin/lxcfs /var/lib/lxcfs/ 1865 root     root     /usr/lib/accountsservice/accounts-daemon 1870 root     root     /usr/lib/snapd/snapd 1875 message+ message+ /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation 1888 root     root     /sbin/mdadm --monitor --pid-file /run/mdadm/monitor.pid --daemonise --scan --syslog 1890 root     root     /usr/lib/policykit-1/polkitd --no-debug 1995 root     root     /sbin/dhclient -1 -v -pf /run/dhclient.enp0s3.pid -lf /var/lib/dhcp/dhclient.enp0s3.leases -I -df /var/lib/dhcp/dhclient6.enp0s3.lease 2184 root     root     /sbin/iscsid 2185 root     root     /sbin/iscsid 2288 root     root     /usr/sbin/irqbalance --pid=/var/run/irqbalance.pid 2294 root     root     /usr/sbin/sshd -D 2566 root     root      \_ sshd: ubuntu [priv] 2602 ubuntu   ubuntu        \_ sshd: ubuntu@pts/0 2603 ubuntu   ubuntu            \_ -bash 2618 ubuntu   ubuntu                \_ ps axfo pid,euser,egroup,args 2301 root     root     /sbin/agetty --keep-baud 115200 38400 9600 ttyS0 vt220 2305 root     root     /sbin/agetty --noclear tty1 linux 2568 ubuntu   ubuntu   /lib/systemd/systemd --user 2570 ubuntu   ubuntu    \_ (sd-pam)