How to view process tree in Linux

It's often useful to see relationship between processes and one way to see it is by looking at process tree.

Basically it's where parent processes are hierarchically listed along with its' child processes and this can be achieved with any of these methods;

  1. Using the universally available ps command with the f option
    $ ps auxf
    USER        PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
    root          2  0.0  0.0      0     0 ?        S    11:28   0:00 [kthreadd]
    root          3  0.2  0.0      0     0 ?        S    11:28   0:00  \_ [kworker/0:0]
    root          4  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [kworker/0:0H]
    root          5  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [kworker/u256:0]
    root          6  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [mm_percpu_wq]
    root          7  0.3  0.0      0     0 ?        S    11:28   0:01  \_ [ksoftirqd/0]
    root          8  0.2  0.0      0     0 ?        S    11:28   0:00  \_ [rcu_sched]
    root          9  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [rcu_bh]
    root         10  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [migration/0]
    root         11  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [watchdog/0]
    root         12  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [cpuhp/0]
    root         13  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [kdevtmpfs]
    root         14  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [netns]
    root         15  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [khungtaskd]
    root         16  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [oom_reaper]
    root         17  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [writeback]
    root         18  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [kcompactd0]
    root         19  0.0  0.0      0     0 ?        SN   11:28   0:00  \_ [ksmd]
    root         20  0.0  0.0      0     0 ?        SN   11:28   0:00  \_ [khugepaged]
    root        228  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [scsi_tmf_30]
    root        229  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [scsi_eh_31]
    root        230  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [scsi_tmf_31]
    root        231  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [scsi_eh_32]
    root        232  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [scsi_tmf_32]
    root        255  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [kworker/u256:27]
    root        256  0.0  0.0      0     0 ?        S    11:28   0:00  \_ [kworker/u256:28]
    root        257  0.1  0.0      0     0 ?        S    11:28   0:00  \_ [kworker/u256:29]
    root        280  0.1  0.0      0     0 ?        S    11:28   0:00  \_ [jbd2/sda1-8]
    root        281  0.0  0.0      0     0 ?        S<   11:28   0:00  \_ [ext4-rsv-conver]
    root        480  0.0  0.0      0     0 ?        S<   11:29   0:00  \_ [nfit]
    root        622  0.0  0.0      0     0 ?        S<   11:29   0:00  \_ [kworker/u257:0]
    root        623  0.0  0.0      0     0 ?        S<   11:29   0:00  \_ [kworker/u257:1]
    root       1569  0.0  0.0      0     0 ?        S<   11:29   0:00  \_ [krfcommd]
    root          1  1.2  0.3 154768  6760 ?        Ss   11:28   0:04 /sbin/init splash
    root        314  0.1  0.2  70648  5664 ?        Ss   11:28   0:00 /lib/systemd/systemd-journald
    root        319  0.1  0.2  46800  4456 ?        Ss   11:28   0:00 /lib/systemd/systemd-udevd
    systemd+    367  0.0  0.1 147416  3236 ?        Ssl  11:28   0:00 /lib/systemd/systemd-timesyncd
    root        368  0.1  0.3 194768  7004 ?        Ssl  11:28   0:00 /usr/bin/vmtoolsd
    root        458  0.0  0.0   4484   604 ?        Ss   11:29   0:00 /usr/sbin/acpid
    root        459  0.0  0.2 427472  5896 ?        Ssl  11:29   0:00 /usr/sbin/ModemManager
    syslog      460  0.0  0.1 256536  2204 ?        Ssl  11:29   0:00 /usr/sbin/rsyslogd -n
    root        468  0.0  0.2  85848  5508 ?        Ss   11:29   0:00 /usr/bin/VGAuthService
    root        469  0.0  0.3 301064  7788 ?        Ssl  11:29   0:00 /usr/lib/accountsservice/accounts-daemon
    root        470  0.0  0.1  31240  2720 ?        Ss   11:29   0:00 /usr/sbin/cron -f
    message+    471  0.2  0.2  49132  4968 ?        Ss   11:29   0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
    root        513  0.1  0.6 565868 12580 ?        Ssl  11:29   0:00 /usr/sbin/NetworkManager --no-daemon
    root        658  0.0  0.1  16220  2672 ?        S    11:29   0:00  \_ /sbin/dhclient -d -q -sf /usr/lib/NetworkManager/nm-dhcp-helper -pf /run/dhclient-ens33.pid -lf /var/lib/NetworkManager/dhclient-015cf265-
    root        514  0.0  0.1  15852  2548 ?        Ss   11:29   0:00 /usr/sbin/anacron -dsq
    avahi       520  0.0  0.1  49452  3372 ?        Ss   11:29   0:00 avahi-daemon: running [ubuntu.local]
    avahi       527  0.0  0.0  49328   104 ?        S    11:29   0:00  \_ avahi-daemon: chroot helper
    root        522  0.0  0.2  65652  4364 ?        Ss   11:29   0:00 /lib/systemd/systemd-logind
    root        524  0.0  0.4 463664  8988 ?        Ssl  11:29   0:00 /usr/lib/udisks2/udisksd
    root        537  0.0  0.4 467148  8516 ?        Ssl  11:29   0:00 /usr/lib/snapd/snapd
    root        570  0.2  0.5 311932 11248 ?        Ssl  11:29   0:00 /usr/lib/policykit-1/polkitd --no-debug
    systemd+    621  0.0  0.1  65580  3360 ?        Ss   11:29   0:00 /lib/systemd/systemd-resolved
    root        639  0.0  0.2  72136  4596 ?        Ss   11:29   0:00 /usr/sbin/sshd -D
    root       1949  0.0  0.2 107696  5700 ?        Ss   11:30   0:00  \_ sshd: user [priv]
    user       2072  0.0  0.2 107988  4220 ?        S    11:30   0:00      \_ sshd: user@pts/1
    user       2073  0.0  0.2  22608  4880 pts/1    Ss   11:30   0:00          \_ -bash
    user      11733  0.0  0.1  42348  3884 pts/1    R+   11:34   0:00              \_ ps auxf
    root        640  0.0  0.3 300832  6876 ?        Ssl  11:29   0:00 /usr/sbin/gdm3
    root        649  0.0  0.3 251912  6844 ?        Sl   11:29   0:00  \_ gdm-session-worker [pam/gdm-launch-environment]
    gdm         684  0.0  0.2 190556  5196 tty1     Ssl+ 11:29   0:00  |   \_ /usr/lib/gdm3/gdm-wayland-session gnome-session --autostart /usr/share/gdm/greeter/autostart
    user       1450  0.0  0.2 190556  5176 tty2     Ssl+ 11:29   0:00      \_ /usr/lib/gdm3/gdm-wayland-session env GNOME_SHELL_SESSION_MODE=ubuntu gnome-session --session=ubuntu
    user       1454  0.1  0.6 580688 12440 tty2     Sl+  11:29   0:00          \_ /usr/lib/gnome-session/gnome-session-binary --session=ubuntu
    user       1535  4.6  6.6 2966844 133364 tty2   Sl+  11:29   0:13              \_ /usr/bin/gnome-shell
    user       1542  0.4  1.6 335964 33308 tty2     S+   11:29   0:01              |   \_ /usr/bin/Xwayland :0 -rootless -terminate -core -listen 4 -listen 5 -displayfd 6
    user       1583  0.0  0.4 369848  8768 tty2     Sl   11:29   0:00              |   \_ ibus-daemon --xim --panel disable
    user       1590  0.0  0.3 289224  7552 tty2     Sl   11:29   0:00              |       \_ /usr/lib/ibus/ibus-dconf
    user       1785  0.0  0.3 213372  7556 tty2     Sl   11:29   0:00              |       \_ /usr/lib/ibus/ibus-engine-simple
    user       1651  0.0  0.3 289112  7472 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-mouse
    user       1653  0.1  1.0 663540 21768 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-power
    user       1654  0.0  0.4 338372  9076 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-print-notifications
    user       1655  0.0  0.2 416104  5672 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-rfkill
    user       1656  0.0  0.2 268492  4424 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-screensaver-proxy
    user       1658  0.0  0.3 385140  7276 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-smartcard
    user       1661  0.1  1.0 576788 20972 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-wacom
    user       1664  0.1  0.9 640776 19972 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-xsettings
    user       1674  0.0  0.5 462332 10204 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-sharing
    user       1676  0.0  0.4 335480  8464 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-sound
    user       1678  0.0  0.9 567992 19444 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-a11y-keyboard
    user       1680  0.1  0.9 491964 19444 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-clipboard
    user       1681  0.0  0.3 289108  7504 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-a11y-settings
    user       1683  0.0  0.5 488816 11812 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-datetime
    user       1684  0.1  1.0 731232 21180 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-color
    user       1687  0.1  0.9 644256 19724 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-keyboard
    user       1689  0.0  0.3 367148  8032 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-housekeeping
    user       1696  0.1  1.0 939084 21332 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-settings-daemon/gsd-media-keys
    user       1824  1.5  4.2 951592 85532 tty2     SLl+ 11:29   0:04              \_ /usr/bin/gnome-software --gapplication-service
    user       1827  1.1  1.7 838836 35588 tty2     Sl+  11:29   0:03              \_ nautilus-desktop
    user       1829  0.0  0.4 166628  8672 tty2     S+   11:29   0:00              \_ kerneloops-applet
    user       1830  0.0  0.2 271496  5448 tty2     Sl+  11:29   0:00              \_ /usr/lib/gnome-disk-utility/gsd-disk-utility-notify
    user       2199  0.0  0.8 594148 18044 tty2     Sl+  11:30   0:00              \_ update-notifier
    user       3402  0.0  0.8 804712 16672 tty2     Sl+  11:31   0:00              \_ /usr/lib/x86_64-linux-gnu/deja-dup/deja-dup-monitor
    gdm         676  0.0  0.2  80228  5552 ?        Ss   11:29   0:00 /lib/systemd/systemd --user
    gdm         677  0.0  0.0 106392  1448 ?        S    11:29   0:00  \_ (sd-pam)
    gdm         686  0.0  0.1  47764  3828 ?        Ss   11:29   0:00  \_ /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation
    gdm         932  0.0  0.3 365160  7480 ?        Ssl  11:29   0:00  \_ /usr/lib/at-spi2-core/at-spi-bus-launcher
    gdm         937  0.0  0.1  47444  3576 ?        S    11:29   0:00  |   \_ /usr/bin/dbus-daemon --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork --print-address 3
    gdm         939  0.0  0.3 220560  6136 ?        Sl   11:29   0:00  \_ /usr/lib/at-spi2-core/at-spi2-registryd --use-gnome-session
    gdm         957  0.0  0.3 1150312 7112 ?        Ssl  11:29   0:00  \_ /usr/bin/pulseaudio --daemonize=no
    whoopsie    730  0.0  0.5 472912 11756 ?        Ssl  11:29   0:00 /usr/bin/whoopsie -f
    kernoops    743  0.0  0.1  56740  2480 ?        Ss   11:29   0:00 /usr/sbin/kerneloops
    root        834  0.0  0.3 311796  7660 ?        Ssl  11:29   0:00 /usr/lib/upower/upowerd
    root        879  0.0  0.1  38472  3692 ?        Ss   11:29   0:00 /usr/lib/bluetooth/bluetoothd
    rtkit       965  0.0  0.1 188076  2956 ?        SNsl 11:29   0:00 /usr/lib/rtkit/rtkit-daemon
    root       1187  1.5  1.2 444740 24224 ?        Ssl  11:29   0:04 /usr/lib/packagekit/packagekitd
    gdm        1217  0.0  1.0 490580 20252 tty1     Sl   11:29   0:00 /usr/lib/ibus/ibus-x11 --kill-daemon
    root       1231  0.0  0.1  48696  3884 ?        Ss   11:29   0:00 /sbin/wpa_supplicant -u -s -O /run/wpa_supplicant
    colord     1371  0.0  0.6 331948 13728 ?        Ssl  11:29   0:00 /usr/lib/colord/colord
    user       1438  0.0  0.2  80292  5756 ?        Ss   11:29   0:00 /lib/systemd/systemd --user
    user       1439  0.0  0.0 106392  1628 ?        S    11:29   0:00  \_ (sd-pam)
    user       1452  0.1  0.2  48244  4488 ?        Ss   11:29   0:00  \_ /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation
    user       1509  0.0  0.3 284664  6364 ?        Ssl  11:29   0:00  \_ /usr/lib/gvfs/gvfsd
    user       1514  0.0  0.3 431588  7208 ?        Sl   11:29   0:00  \_ /usr/lib/gvfs/gvfsd-fuse /run/user/1000/gvfs -f -o big_writes
    user       1545  0.0  0.3 367456  7620 ?        Ssl  11:29   0:00  \_ /usr/lib/at-spi2-core/at-spi-bus-launcher
    user       1550  0.0  0.1  47448  3620 ?        S    11:29   0:00  |   \_ /usr/bin/dbus-daemon --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork --print-address 3
    user       1552  0.0  0.3 220560  6208 ?        Sl   11:29   0:00  \_ /usr/lib/at-spi2-core/at-spi2-registryd --use-gnome-session
    user       1571  0.0  0.5 621552 10184 ?        Sl   11:29   0:00  \_ /usr/lib/gnome-shell/gnome-shell-calendar-server
    user       1575  0.0  0.7 777848 15572 ?        Ssl  11:29   0:00  \_ /usr/lib/evolution/evolution-source-registry
    user       1582  0.0  0.7 793404 15964 ?        Sl   11:29   0:00  \_ /usr/lib/gnome-online-accounts/goa-daemon
    user       1611  0.0  0.4 385792  8248 ?        Sl   11:29   0:00  \_ /usr/lib/gnome-online-accounts/goa-identity-service
    user       1624  0.0  0.2 187772  5028 ?        Sl   11:29   0:00  \_ /usr/lib/dconf/dconf-service
    user       1628  0.0  0.4 312408  8928 ?        Ssl  11:29   0:00  \_ /usr/lib/gvfs/gvfs-udisks2-volume-monitor
    user       1632  0.0  0.2 281256  5948 ?        Ssl  11:29   0:00  \_ /usr/lib/gvfs/gvfs-gphoto2-volume-monitor
    user       1636  0.0  0.2 266808  5348 ?        Ssl  11:29   0:00  \_ /usr/lib/gvfs/gvfs-goa-volume-monitor
    user       1640  0.0  0.3 368192  7088 ?        Ssl  11:29   0:00  \_ /usr/lib/gvfs/gvfs-afc-volume-monitor
    user       1645  0.0  0.2 268624  4564 ?        Ssl  11:29   0:00  \_ /usr/lib/gvfs/gvfs-mtp-volume-monitor
    user       1733  0.1  0.9 872004 19644 ?        Ssl  11:29   0:00  \_ /usr/lib/evolution/evolution-calendar-factory
    user       1740  0.0  0.7 805376 14524 ?        Sl   11:29   0:00  |   \_ /usr/lib/evolution/evolution-calendar-factory-subprocess --factory contacts --bus-name org.gnome.evolution.dataserver.Subprocess.Backe
    user       1751  0.0  0.7 786384 14164 ?        Sl   11:29   0:00  |   \_ /usr/lib/evolution/evolution-calendar-factory-subprocess --factory local --bus-name org.gnome.evolution.dataserver.Subprocess.Backend.
    user       1750  0.0  0.6 725676 13204 ?        Ssl  11:29   0:00  \_ /usr/lib/evolution/evolution-addressbook-factory
    user       1762  0.0  0.5 810928 11480 ?        Sl   11:29   0:00  |   \_ /usr/lib/evolution/evolution-addressbook-factory-subprocess --factory local --bus-name org.gnome.evolution.dataserver.Subprocess.Backe
    user       1842  0.0  0.4 376412  8564 ?        Sl   11:30   0:00  \_ /usr/lib/gvfs/gvfsd-trash --spawner :1.3 /org/gtk/gvfs/exec_spaw/0
    user       1880  0.2  1.1 794472 23916 ?        Ssl  11:30   0:00  \_ /usr/lib/gnome-terminal/gnome-terminal-server
    user       1888  0.0  0.2  22512  4752 pts/0    Ss+  11:30   0:00  |   \_ bash
    user       3318  0.0  0.2 195140  5436 ?        Ssl  11:31   0:00  \_ /usr/lib/gvfs/gvfsd-metadata
    user       1446  0.0  0.2 281064  5480 ?        Sl   11:29   0:00 /usr/bin/gnome-keyring-daemon --daemonize --login
    user       1558  0.0  0.3 1169072 7072 ?        S<l  11:29   0:00 /usr/bin/pulseaudio --start --log-target=syslog
    user       1592  0.0  0.9 492328 19604 tty2     Sl   11:29   0:00 /usr/lib/ibus/ibus-x11 --kill-daemon
    user       1718  0.0  0.5 524744 11320 tty2     Sl+  11:29   0:00 /usr/lib/gnome-settings-daemon/gsd-printer
    root       1863  0.1  0.7 548488 14860 ?        Ssl  11:30   0:00 /usr/lib/fwupd/fwupd
    root       1904  0.0  0.0   4592   828 ?        Ss   11:30   0:00 /bin/sh /usr/lib/apt/apt.systemd.daily install
    root       1908  0.0  0.0   4592  1712 ?        S    11:30   0:00  \_ /bin/sh /usr/lib/apt/apt.systemd.daily lock_is_held install
    root       1939 31.8  2.9 172664 58696 ?        S    11:30   1:13      \_ /usr/bin/python3 /usr/bin/unattended-upgrade
    root       4610  1.5  2.6 173564 54264 ?        S    11:33   0:00          \_ /usr/bin/python3 /usr/bin/unattended-upgrade
    root       4697  0.0  0.3  23068  7172 pts/2    Ss+  11:33   0:00              \_ /usr/bin/dpkg --status-fd 10 --configure --pending
    root       4698  0.0  0.3  25364  6404 pts/2    S+   11:33   0:00                  \_ /usr/bin/perl /var/lib/dpkg/info/linux-image-4.13.0-32-generic.postinst configure
    root       4725  0.0  0.0   4452   888 pts/2    S+   11:33   0:00                      \_ run-parts --verbose --exit-on-error --arg=4.13.0-32-generic --arg=/boot/vmlinuz-4.13.0-32-generic /etc/kernel/postinst
    root       4775  0.0  0.0   4592   848 pts/2    S+   11:33   0:00                          \_ /bin/sh -e /etc/kernel/postinst.d/initramfs-tools 4.13.0-32-generic /boot/vmlinuz-4.13.0-32-generic
    root       4777  0.0  0.0   4592   852 pts/2    S+   11:33   0:00                              \_ /bin/sh /usr/sbin/update-initramfs -c -t -k 4.13.0-32-generic -b /boot
    root       4779  0.1  0.0   4724  1912 pts/2    S+   11:33   0:00                                  \_ /bin/sh /usr/sbin/mkinitramfs -o /boot/initrd.img-4.13.0-32-generic.new 4.13.0-32-generic
    root      11732 25.0  0.9  22716 19744 pts/2    R+   11:34   0:00                                      \_ depmod -a -b /var/tmp/mkinitramfs_Ca437K 4.13.0-32-generic
    root       7243  0.1  0.3 101496  7984 ?        Ss   11:34   0:00 /usr/sbin/cupsd -l
    root       7244  0.2  0.5 299656 10712 ?        Ssl  11:34   0:00 /usr/sbin/cups-browsed
  2. pstree command which was developed for this specific purpose
    $ pstree
    systemd─┬─ModemManager───2*[{ModemManager}]
            ├─NetworkManager─┬─dhclient
            │                └─2*[{NetworkManager}]
            ├─VGAuthService
            ├─accounts-daemon───2*[{accounts-daemon}]
            ├─acpid
            ├─anacron
            ├─apt.systemd.dai───apt.systemd.dai───unattended-upgr───unattended-upgr
            ├─avahi-daemon───avahi-daemon
            ├─bluetoothd
            ├─colord───2*[{colord}]
            ├─cron
            ├─cups-browsed───2*[{cups-browsed}]
            ├─cupsd
            ├─dbus-daemon
            ├─fwupd───4*[{fwupd}]
            ├─gdm3─┬─gdm-session-wor─┬─gdm-wayland-ses─┬─gnome-session-b─┬─gnome-shell─┬─Xwayland
            │      │                 │                 │                 │             ├─ibus-daemon─┬─ibus-dconf───3*[{ibus-dconf}]
            │      │                 │                 │                 │             │             ├─ibus-engine-sim───2*[{ibus-engine-sim}]
            │      │                 │                 │                 │             │             └─2*[{ibus-daemon}]
            │      │                 │                 │                 │             └─9*[{gnome-shell}]
            │      │                 │                 │                 ├─gsd-a11y-keyboa───3*[{gsd-a11y-keyboa}]
            │      │                 │                 │                 ├─gsd-a11y-settin───3*[{gsd-a11y-settin}]
            │      │                 │                 │                 ├─gsd-clipboard───2*[{gsd-clipboard}]
            │      │                 │                 │                 ├─gsd-color───3*[{gsd-color}]
            │      │                 │                 │                 ├─gsd-datetime───2*[{gsd-datetime}]
            │      │                 │                 │                 ├─gsd-housekeepin───2*[{gsd-housekeepin}]
            │      │                 │                 │                 ├─gsd-keyboard───3*[{gsd-keyboard}]
            │      │                 │                 │                 ├─gsd-media-keys───3*[{gsd-media-keys}]
            │      │                 │                 │                 ├─gsd-mouse───2*[{gsd-mouse}]
            │      │                 │                 │                 ├─gsd-power───3*[{gsd-power}]
            │      │                 │                 │                 ├─gsd-print-notif───2*[{gsd-print-notif}]
            │      │                 │                 │                 ├─gsd-rfkill───2*[{gsd-rfkill}]
            │      │                 │                 │                 ├─gsd-screensaver───2*[{gsd-screensaver}]
            │      │                 │                 │                 ├─gsd-sharing───3*[{gsd-sharing}]
            │      │                 │                 │                 ├─gsd-smartcard───4*[{gsd-smartcard}]
            │      │                 │                 │                 ├─gsd-sound───3*[{gsd-sound}]
            │      │                 │                 │                 ├─gsd-wacom───2*[{gsd-wacom}]
            │      │                 │                 │                 ├─gsd-xsettings───3*[{gsd-xsettings}]
            │      │                 │                 │                 └─3*[{gnome-session-b}]
            │      │                 │                 └─2*[{gdm-wayland-ses}]
            │      │                 └─2*[{gdm-session-wor}]
            │      ├─gdm-session-wor─┬─gdm-wayland-ses─┬─gnome-session-b─┬─gnome-shell─┬─Xwayland
            │      │                 │                 │                 │             ├─ibus-daemon─┬─ibus-dconf───3*[{ibus-dconf}]
            │      │                 │                 │                 │             │             ├─ibus-engine-sim───2*[{ibus-engine-sim}]
            │      │                 │                 │                 │             │             └─2*[{ibus-daemon}]
            │      │                 │                 │                 │             └─9*[{gnome-shell}]
            │      │                 │                 │                 ├─gnome-software───4*[{gnome-software}]
            │      │                 │                 │                 ├─gsd-a11y-keyboa───3*[{gsd-a11y-keyboa}]
            │      │                 │                 │                 ├─gsd-a11y-settin───3*[{gsd-a11y-settin}]
            │      │                 │                 │                 ├─gsd-clipboard───2*[{gsd-clipboard}]
            │      │                 │                 │                 ├─gsd-color───3*[{gsd-color}]
            │      │                 │                 │                 ├─gsd-datetime───3*[{gsd-datetime}]
            │      │                 │                 │                 ├─gsd-disk-utilit───2*[{gsd-disk-utilit}]
            │      │                 │                 │                 ├─gsd-housekeepin───3*[{gsd-housekeepin}]
            │      │                 │                 │                 ├─gsd-keyboard───3*[{gsd-keyboard}]
            │      │                 │                 │                 ├─gsd-media-keys───3*[{gsd-media-keys}]
            │      │                 │                 │                 ├─gsd-mouse───3*[{gsd-mouse}]
            │      │                 │                 │                 ├─gsd-power───3*[{gsd-power}]
            │      │                 │                 │                 ├─gsd-print-notif───2*[{gsd-print-notif}]
            │      │                 │                 │                 ├─gsd-rfkill───2*[{gsd-rfkill}]
            │      │                 │                 │                 ├─gsd-screensaver───2*[{gsd-screensaver}]
            │      │                 │                 │                 ├─gsd-sharing───3*[{gsd-sharing}]
            │      │                 │                 │                 ├─gsd-smartcard───4*[{gsd-smartcard}]
            │      │                 │                 │                 ├─gsd-sound───3*[{gsd-sound}]
            │      │                 │                 │                 ├─gsd-wacom───2*[{gsd-wacom}]
            │      │                 │                 │                 ├─gsd-xsettings───3*[{gsd-xsettings}]
            │      │                 │                 │                 ├─kerneloops-appl
            │      │                 │                 │                 ├─nautilus-deskto───3*[{nautilus-deskto}]
            │      │                 │                 │                 ├─update-notifier───3*[{update-notifier}]
            │      │                 │                 │                 └─3*[{gnome-session-b}]
            │      │                 │                 └─2*[{gdm-wayland-ses}]
            │      │                 └─2*[{gdm-session-wor}]
            │      └─2*[{gdm3}]
            ├─gnome-keyring-d───3*[{gnome-keyring-d}]
            ├─gsd-printer───2*[{gsd-printer}]
            ├─2*[ibus-x11───2*[{ibus-x11}]]
            ├─kerneloops
            ├─packagekitd───3*[{packagekitd}]
            ├─polkitd───2*[{polkitd}]
            ├─pulseaudio───2*[{pulseaudio}]
            ├─rsyslogd───3*[{rsyslogd}]
            ├─rtkit-daemon───2*[{rtkit-daemon}]
            ├─snapd───6*[{snapd}]
            ├─sshd───sshd───sshd───bash───pstree
            ├─systemd─┬─(sd-pam)
            │         ├─at-spi-bus-laun─┬─dbus-daemon
            │         │                 └─3*[{at-spi-bus-laun}]
            │         ├─at-spi2-registr───2*[{at-spi2-registr}]
            │         ├─dbus-daemon
            │         └─pulseaudio───2*[{pulseaudio}]
            ├─systemd─┬─(sd-pam)
            │         ├─at-spi-bus-laun─┬─dbus-daemon
            │         │                 └─3*[{at-spi-bus-laun}]
            │         ├─at-spi2-registr───2*[{at-spi2-registr}]
            │         ├─dbus-daemon
            │         ├─dconf-service───2*[{dconf-service}]
            │         ├─evolution-addre─┬─evolution-addre───5*[{evolution-addre}]
            │         │                 └─4*[{evolution-addre}]
            │         ├─evolution-calen─┬─2*[evolution-calen───6*[{evolution-calen}]]
            │         │                 └─4*[{evolution-calen}]
            │         ├─evolution-sourc───3*[{evolution-sourc}]
            │         ├─gnome-shell-cal───5*[{gnome-shell-cal}]
            │         ├─gnome-terminal-─┬─bash
            │         │                 └─3*[{gnome-terminal-}]
            │         ├─goa-daemon───4*[{goa-daemon}]
            │         ├─goa-identity-se───3*[{goa-identity-se}]
            │         ├─gvfs-afc-volume───3*[{gvfs-afc-volume}]
            │         ├─gvfs-goa-volume───2*[{gvfs-goa-volume}]
            │         ├─gvfs-gphoto2-vo───2*[{gvfs-gphoto2-vo}]
            │         ├─gvfs-mtp-volume───2*[{gvfs-mtp-volume}]
            │         ├─gvfs-udisks2-vo───2*[{gvfs-udisks2-vo}]
            │         ├─gvfsd───2*[{gvfsd}]
            │         ├─gvfsd-fuse───5*[{gvfsd-fuse}]
            │         ├─gvfsd-metadata───2*[{gvfsd-metadata}]
            │         └─gvfsd-trash───2*[{gvfsd-trash}]
            ├─systemd-journal
            ├─systemd-logind
            ├─systemd-resolve
            ├─systemd-timesyn───{systemd-timesyn}
            ├─systemd-udevd
            ├─udisksd───4*[{udisksd}]
            ├─upowerd───2*[{upowerd}]
            ├─vmtoolsd───{vmtoolsd}
            ├─whoopsie───2*[{whoopsie}]
            └─wpa_supplicant

    pstree might not be available by default in some Linux distributions thus need to be installed