[bash shell] 값 증가

value=100

value2=100

value=$((value+1))

value=$((value+value2))

value=$((value=value+1))

value=$((value+=1))

value=$((value++))

let "value=value+1"

let "value=value+value2"

let "value+=1"

let "value++"

ref. https://askubuntu.com/questions/385528/how-to-increment-a-variable-in-bash

참 신기하다...