I put below line in a sh file
----------------------------------
#!/bin/bash
HOSTS=172.16.14.1

COUNT=4

for myHost in $HOSTS
do
count=$(ping -c $COUNT $myHost | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')
if [ $count -eq 0 ]; then
# 100% failed
echo "Host : $myHost is down (ping failed) at $(date)" >> /var/sun/status
fi
done
------------------------------------------

after that I edited crontab -e (logged as root) and entered a like below in that

01 * * * * root /var/sun/./chk.sh > /dev/null 2>&1

but thr is no output in file /var/sun/status

when I manually run that script it paste output in said file.

what's wrong ?

cron sets a very limited $PATH. The workaround is either to set the usual $PATH in the script with export PATH=whatever or to prefix all commands with their full path, example change ping to /bin/ping.

I can see many things
1. This script will execute 1st minute of every hour. So You have to wait for an hour to get some output from it.

2. /var/sun/./chk.sh, Is the part in Color Red Intentional. Although it will work.

3. Rather than directing the STDOUT and STDERR to /dev/null redirect them to a file. This might help in finding possible errors.

what is I want to execute above script every minute ?

use,

* * * * * /bin/sh /var/sun/./chk.sh > /dev/null 2>&1