用户登陆时，/etc/porfile.d目录下的脚本会加载

/etc/profile.d/jump_info.sh

最简单的jumpserver，只打印提示信息

echo -e "\033[32m========================================\033[0m"
echo -e "\033[32m         server list          \033[0m"
echo -e "\033[32m========================================\033[0m"
echo "DEV-SERVICE   192.168.0.10"
echo "DEV-SEARCH    192.168.0.20"
echo "DEV-JENKINS   192.168.0.30"
echo "DEV-DB        192.168.0.40"