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pstree is useful tool, but it is not a default application when you setup CentOS. So you will need to install it by yum. |
You will be able to use pstree after running below:
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sudo yum -y install psmisc |
Below is an exmple of pstree
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# pstree
systemd-+-NetworkManager---2*[{NetworkManager}]
|-agetty
|-auditd---{auditd}
|-automount---5*[{automount}]
|-chronyd
|-crond
|-dbus-daemon
|-httpd---11*[httpd]
|-irqbalance
|-java-+-java---67*[{java}]
| `-193*[{java}]
|-java---157*[{java}]
|-lvmetad
|-master-+-anvil
| |-bounce
| |-cleanup
| |-pickup
| |-qmgr
| |-smtp
| `-trivial-rewrite
|-memcached---5*[{memcached}]
|-mysqld_safe---mysqld---120*[{mysqld}]
|-polkitd---6*[{polkitd}]
|-postgres---49*[postgres]
|-redis-server---2*[{redis-server}]
|-rsyslogd---2*[{rsyslogd}]
|-sshd---sshd---sshd---bash---su---bash---pstree
|-systemd-journal
|-systemd-logind
|-systemd-udevd
`-tuned---4*[{tuned}] |