Shell Programming and Scripting

This script is to send a email if the IP adress is active
when i run this script it is working and sending emails to external users in different domains, but when this script is scheduled in a cron it is unable to send the emails

Code:

 
#/bin/sh
ifconfig -a | grep 192.168.0.1
if [ $? == '0' ];
then mail -s "subject" mail.domain.com < /home/user/mailmessage.txt
fi

So i used a while loop avoding cron, Below is the code, This is able to send the emails,

Code:

#/bin/sh
while :
do
ifconfig -a | grep 3.229.224.157
if [ $? == '0' ]
then 
   mail -s "CRITICAL!! PAN Credit Application Load Balancing Has Failed Over to MYUKSLCAP2LB002" -c \
  emailaddress@fqdn.com < \
   /home/smg_prod/mailmessage.txt
fi
sleep 60
done

But for the same code why it is not able to send emails when set via cron, checked cronlogs and found no errors, cron is executed as schedules, also checked messages no errors found

Go with numerical comparator ..

Code:

if [ $? -eq 0 ];

Check the hash-bang statement in the first line, it should be #!/bin/sh.
Does the user have privileges for running cron? Paste the cron entry.

--ahamed

Did you check if it works when being run manually from a shell?
There is also missing a ! in the shebang:

Code:

#!/bin/ksh
...

Yes running as root

Tried changing the first line but still not working

Paste the cron entry... crontab -l

--ahamed

i tried changing the code

Code:

#!/bin/sh

but cron is not sending the emails but when run manually from shell it is sending the mails i checked now

---------- Post updated at 09:29 AM ---------- Previous update was at 09:28 AM ----------

Code:

26 * * * * /home/user/Loadbalancercheck.sh

particular entry for the script