there are two hosts in the same intranet:
Here is an example to test network accessibility in bash script. It runs on host A. If A can access B, it returns “OK”, or returns “Failed”
#!/usr/bin/env bash
ping -c 1 192.168.0.102 > /dev/null
if [ $? -eq 0 ]; then
echo "OK"
else
echo "Failed"
fi
ping -c-c count
Stop after sending count ECHO_REQUEST packets. With deadline option, ping waits for count ECHO_REPLY packets, until the timeout expires.
/dev/nullWhat is /dev/null?
It is a virtual device, which has a special property: Any data written to /dev/null vanishes or disappears. Because of this characteristic, it is also called bitbucket or blackhole.
Quoted from https://www.geeksforgeeks.org/what-is-dev-null-in-linux/
$?This is the exit status of the last executed command.
For example the command true always returns a status of 0 and false always returns a status of 1:
true
echo $? # echoes 0
false
echo $? # echoes 1
Quoted from https://stackoverflow.com/questions/7248031/meaning-of-dollar-question-mark-in-shell-scripts