OpenSUSE install sudo to execute commands as root

There is no sudo installed by default on my OpenSUSE Linux server. Other users and I need to use ‘su -‘ command to run commands as root. How do I install a sudo package on OpenSUSE Linux?
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How to append text to a file when using sudo command on Linux or Unix

I am trying to add entry to /etc/hosts file using ‘sudo echo '192.168.1.254 router' >> /etc/hosts‘ but getting an error that read as, -bash: /etc/hosts: Permission denied. How do I insert or append text to a file when running sudo command on Linux or Unix-like system?
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Google Chrome Clear or flush the DNS cache

I think Google has its own dns caching system. I am getting the same old dns entry in my Google Chrome browser on both Linux and Apple OS X. How do I flush or clear the DNS cache in Google Chrome browser without compete shutting down?
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How to run multiple commands in sudo under Linux or Unix

I am a new Linux user. How do I run two commands from a bash shell? I need to run apt-get update and apt-get -y upgrade without typing sudo command two times from a command line on Ubuntu Linux AWS cloud server. How can I two commands in sudo ‘command1 && command2’?
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How to run sudo command without a password on a Linux or Unix

I‘m a new Unix system user. How do I use sudo command without a password on a Linux or Unix-like systems? I log in as tom@my-cloud-server-ip and disabled root login for ssh. After login, I need to run some commands as root user. I am the only sysadmin using my server. How do I run or execute sudo command without a password for a user named Tom under Debian/Ubuntu/CentOS Linux cloud server?
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