When the cron job runs, it outputs the result to the standard output (STDOUT) or standard error (STDERR). Especially, if you execute
wget command, it creates a new file at every time. You might want to suppress the output of the cron, and this tutorial tells how to do it.
Open the crontab with your favorite text editor:
$ vim /etc/crontab
Add /dev/null redirection at the end of the line, as follows:
* * * * * /home/user/myscript.sh >/dev/null 2>&1
>/dev/nulltells the cron to send all output (STDOUT) to /dev/null, which acts as a “black hole” for useless data
2>&1tells the cron to send errors (STDERR) to same target than normal output (STDOUT)
After this you won’t see any output or logs after the cron script is executed.