Branch statements, loop statements, functions in shell

Implement a function that sums an array, passing the array as an actual parameter to the function

#!/bin/bash
sum()
{
	for i in $@
	do
		((sum+=i))
	done
	echo $sum
	
}
read -p "请输入一组数字: " -a arr
sum ${arr[*]}

2 Call the function, output the current user's uid gid and use variables to receive the results

#!/bin/bash

get()
{
	uid=$(id -u)
	gid=$(id -g)
	echo uid=$uid gid=$gid

}
ret=$(get)
echo $ret

mind Mapping