#!/bin/bash A() { file="/root/mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz" if [ ! -f "$file" ]; then echo "mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz does not exist,need Upload it to /root directory" exit 0 else echo "mysql-8.0.17-linux-glibc2.12-x86_64.tar.xz is exist!!!" fi if [ `whoami` != "roo...