">Don't know without knowing the exact IOS version you're using (and sometimes access to the device).
I use cat4500e-entservicesk9-mz.152-4.E10a.bin on the 4900M"
Okay, just (quickly) looked at the command reference and config guide manuals for that IOS version. From my reading it's unclear (to me) what's a required part of the command. (To me) it appears conform and exceed action parameters are required, although they might be listed as subsequent configuration lines. (Which is why I noted, sometime actual device access is needed. I.e. to "see" what the device does when entering and listing the command in various ways.)
"Input/output bandwidth limiter of the port to which a device is connected (200M, 500M, ...)"
Sure, I understood that. Perhaps unclear to you, both shapers and policers limit bandwidth, but HOW they impact traffic differs a bit. See https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html. Again, when I note I don't know what YOU wish to accomplish, I mean more than just limiting bandwidth. Hopefully, the prior reference will help you understand the two approaches.
"Shaper not work in both direction, police work in both direction. It's possible to mix police/shaper.
But I don't know what is the best way to be able to limit the bandwidth of a given port."
Yep, shaper only works for egress because it queues excess (again see prior reference). Also again, both will limit bandwidth, and both can limit to the same bandwidth usage. Also again, what's "best way", depends on what YOU are trying to accomplish. Lastly, and also again, IMO, given a choice, usually I consider a shaper "better", but each has its pluses and minuses (as noted in the reference).
