What does the awk -v option mean? A little dizzy -v var = val-assign = var = val.

Simply put, variables in the shell can't be used in AWK programs, because when executing AWK, it is a new process to deal with it, so you need -v to pass parameters to awk programs. For example, if you have a variable a= 15 in the shell program, you can't use the variable A directly in the awk program, but use awk -v b=a, then it will be in the awk program. It's equivalent to using one!