basic question, disabling command feedback

Hi,
I am a new user, using tcl 8.4
I have a basic question,
when we do 'set a 1', it will gives feedback as '1'

set a 1
1


Is it possible to disable this feedback feature?
such as:

set a 1


I am wondering if there any switch or parameter that I can set.
Or if there is't any, is there any tips to do it ?

Thanks
kong
.

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