I found that my unix box can't use ctrl-C to break the process ( stopping a running process from the terminal--e.g. a long document being read with "more".) , the TERM setting is vt220 now , can advise how to fix it ? thx

use the command
stty intr "^F"

for typing ^F you should use the following key combination

<ctrl-v><ctrl-f>

if any issue let me know

Best Regards,
Rakesh UV

thx reply ,

But I am too understand what I need to do to fix it ? thx

I have a stupid suggestion , if ctrl-Z works , is it OK to set to when user press ctrl-C , it will send the ctrl-Z key ? thx

if you run the command
stty intr "^F"

then ^F works as a ^C

you can do the same for ^C

stty intr "^C"

now your ^C will works as you expected, let me know if you face a problem