below excution.. when run directly from console.. works.. (through script name).. but when i run from cron.. i get below... why?

I have auto ssh into server enabled via authorization key..

Is there way for me to run as me? for cron or??

[ output from cron.. executing the script.. that was mail to me ]
+ rm -rf /tmp/something
+ date +%H
current=23
+ ssh server01 tail -1 /xxx/xxx
/home/user/filename: ssh: execute permission denied