day 4

#!/bin/bash

function adda()
{   
    #a=($*)
    sum=0 
    for i in $*
    do  
        ((sum+=i))
    done
    return $sum
}

arr=(5 4 3 2 1 50)
adda ${arr[*]}
add=$?
echo $add


function A()
{                        
    echo `id -u`
    echo `id -g`
}

B=`A`
echo "uid和gid分别是:"$B

xmind