Changing knob values

syntax:

knob .

examples:

knob Blur1.size 10
knob Blur1.name BlurWithNewName

Reading knob values

To print info into the shell use "puts". This is Tcl's print command.
You will have to use square brackets to tell Tcl to evaluate the knob command first and then use the result for the puts command:

puts [knob Blur1.size]

If you want to go fancy you can pop up a message windo instead of printing into the shell:

message [knob Blur1.size]