i want to run a command every hour - how i can do this without using cron-tab?

edit

I have a folder that I want cleared every hour when I am logged in. I added a .desltop file that points to my shell script shell in the /home/user/.config/autorun Note: Replace username with the actual user's userID
You can also modify the path to your scipt as you desire.

--- example of desktop file ---
[Desktop Entry]
Comment[en_US]=
Comment=
Encoding=UTF-8
Exec=/home/**username**/bin/setx
GenericName[en_US]=
GenericName=
Hidden=false
Icon=computer-laptop
MimeType=
Name[en_US]=Set X video
Name=Set X video
Path=/home/**username**/bin
StartupNotify=false
Terminal=false
TerminalOptions=
Type=Application
Version=1.0
X-DBUS-ServiceName=
X-DBUS-StartupType=
X-KDE-SubstituteUID=false
X-KDE-Username=

--- end of desktop file ---

in my script I do whatever is necessary but first I lock it in a loop when the script hits the sleep command it will sleep for N seconds example: sleep 60 Will sleep for 1 minute. (please not that the code below is pseudo and not tested)

while [ true ]; do
   dosomething
   sleep [number of seconds to sleep for]
done

If you don't want to use cron for some reason, you can also do scheduled tasks with systemd timer units.

man systemd.timer explains how. There are some existing .timer files in /usr/lib/systemd/system/ you can use as a guide.

with crontab installed, you may put your command into a file under "/etc/cron.hourly"

for normal user, create e crontab file (crontab -u user -e); see man page [crontab(5)] for the meaning of each fields, if you read carefully, at the end you will find the answer to your question.