Since you are executing echoa cron script in a job, you need to write its output somewhere.
In your mode shebangand the file (with chmod +x) everything is in order, so this is not a problem, and work without /bin/shshould work fine.
, cron.log ( )
* * * * * /home/user/simple.sh >> /home/user/cron.log
, cron , .
(, postman, mutt ..), cron .