BASH特定设备的特定IP地址

Question

I can't seem to get this thing to work. I need to verify specific ip address on a specific card. I created a simple function, that receives two variables, the device name ( $1 ) and ip address ( $2 ). I need to also return the value of true/false (0/1). The test works properly (I used debug code) but the return value is always empty. It needs to be a function because, it will be called several times. I have tried several variations on return value all seem to return blank. This was my latest iteration.

#!/bin/bash

function ip_addr_tst()
{ 
    ip addr show dev $1|fgrep -q "$2"
    if [ $? -eq 0 ]; then
        retval=0
        echo "found"
    else
        retval=1
        echo "not found"
    fi
    return "$retval"
}

answer=$(ip_addr_tst ens192 192.168.2.180)
echo $answer

Answer 1

so I used echo $? and it worked. I tested with false and true Network cards/Ip addresses and it worked perfectly. Just so people can see

function ip_addr_tst() {

ip addr show dev $1|fgrep -q "$2"

if [ $? -eq 0 ]; then
    retval=0
    echo "found"
else
    retval=1
    echo "not found"
fi
return "$retval"

}

answer=$(ip_addr_tst ens192 192.168.2.180)

echo $?