Crontab doesn't execute .sh script in Amazon-EC2

Question

I setted up a Cron Job in Amazon-EC2.
First, I edited the crontab: crontab -e
Adding the following:

* * * * * /home/ubuntu/run.sh &>> /home/ubuntu/output.txt
* * * * * /usr/bin/uptime > /tmp/uptime

The content of run.sh is just

echo 123;
echo 321;

The uptime file is being updated with something like:

12:57:01 up  1:07,  1 user,  load average: 0.00, 0.00, 0.00

However, the output.txt file remains empty.
Executing ps -ef | grep cron | grep -v grep returns:

root         440       1  0 11:50 ?        00:00:00 /usr/sbin/cron -f

And executing crontab -l outputs the content I added through crontab -e
Running run.sh with :~$ /home/ubuntu/run.sh &>> /home/ubuntu/output.txt appends output.txt file as expected.

Answer 1

Suggesting to modify your run.sh

#!/bin/sh
/usr/bin/echo 123
/usr/bin/echo 321