Show elapsed (round-trip) time of packets.

$fping -e www.gnu.org
www.gnu.org is alive (301 ms)
$fping -e www.gnu.org
www.gnu.org is alive (302 ms)
$fping -e www.rajagiritech.edu.in
www.rajagiritech.edu.in is alive (62.2 ms)
$fping www.gnu.org
www.gnu.org is alive
$ping www.gnu.org
PING wildebeest.gnu.org (208.118.235.148) 56(84) bytes of data.
64 bytes from wildebeest.gnu.org (208.118.235.148): icmp_seq=1 ttl=49 time=302 ms
64 bytes from wildebeest.gnu.org (208.118.235.148): icmp_seq=2 ttl=49 time=301 ms
64 bytes from wildebeest.gnu.org (208.118.235.148): icmp_seq=3 ttl=49 time=302 ms
^C
--- wildebeest.gnu.org ping statistics ---
4 packets transmitted, 3 received, 25% packet loss, time 3ms
rtt min/avg/max/mdev = 301.312/301.802/302.169/0.360 ms
$ping www.rajagiritech.edu.in
PING rajagiritech.edu.in (202.88.225.163) 56(84) bytes of data.
64 bytes from 163.225.88.202.asianet.co.in (202.88.225.163): icmp_seq=1 ttl=56 time=62.4 ms
64 bytes from 163.225.88.202.asianet.co.in (202.88.225.163): icmp_seq=2 ttl=56 time=62.0 ms
64 bytes from 163.225.88.202.asianet.co.in (202.88.225.163): icmp_seq=3 ttl=56 time=62.4 ms
^C
--- rajagiritech.edu.in ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 4ms
rtt min/avg/max/mdev = 62.038/62.254/62.368/0.254 ms
$

pstree command usage example with process id as first argument

ABOUT pstree

pstree is a Linux command that shows the running processes as a tree. It is used as a more visual alternative to the ps command. The root of the tree is either init or the process with the given pid. It can also be installed in other Unix systems.

TYPICAL COMMANDLINE SESSION
[bash]
$pidof systemd
1461 1059
$pstree 1461
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─┬─evolution-calen───9*[{evolution-calen}]
│ └─4*[{evolution-calen}]
├─evolution-sourc───3*[{evolution-sourc}]
├─gnome-shell-cal───5*[{gnome-shell-cal}]
├─gnome-terminal-─┬─bash───pstree
│ └─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}]
├─mission-control───3*[{mission-control}]
├─pulseaudio───2*[{pulseaudio}]
└─tracker-store───7*[{tracker-store}]
$pstree 1059
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}]
$

[/bash]
[bash]
$pstree `pidof systemd | awk ‘{print $2}’`
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}]
$

[/bash]
LINK
https://en.wikipedia.org/wiki/Pstree