how to CTRL-A in a script

i know this is a stupid question and i'll slap my forehead and say i KNEW that when i find out, but...

a very useful feature of vim is the ability to hit CTRL-A in normal mode to increment whatever number is nearby by one -- but if i want to do the same thing in a script, normal CTRL-A is not the way

what is?

thx in advance,

toothpik

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