Meaning of "* */1 * * *" cron entry?

• * means every.
• */n means every nth. (So */1 means every 1.)

If you want to run it only once each hour, you have to set the first item to something else then *, for example 20 * * * * to run it every hour at minute 20.

Or if you have permission to write /etc/cron.hourly/ (or whatever it is on your system), then you could place a script there.

The */1 is redundant, you should use * instead.

* */1 * * *

does not run the job every hour, runs it every minute!
To run a job every hour (at 1:00, 2:00, etc.) use

0 * * * *