How to Check sudo using shell script

Please find the below the code:

#!bin/bash

#Sudo Check
sudoCheck()
{
    uid=`id | sed -e 's;^.*uid=;;' -e 's;\([0-9]\)(.*;\1;'`
    if [ "$uid" = "0" ] ; then
        SUDO=" "
    else
        SUDO=`which sudo 2>/dev/null`
        if [ -z "$SUDO" ] ; then
            echo "ERROR sudo not found!"
            exit 1
        fi
    fi
}

main()
{
	sudoCheck
}

main

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