shell编程求助，如何使变量自动加1

Question

如题所述

Answer 1

#!/bin/bash

A=1
for i in {1..10};
do
  ##A+1
  A=$A+1
done

Answer 2

#!/bin/sh
while true
do
i=${i}+1
echo "${i}"

done

Answer 3

你反复 echo
"$((plusone++))"一下看能变化否