How to run sudo command without a password on a Linux or Unix

Posted on in Categories , , , , , , last updated April 18, 2017

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 [email protected] 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?

Sudo is Not Prompting For a Password When Re-executed Second Time

Posted on in Categories , , , , , , , , , , , last updated May 2, 2012

I use sudo to provide permissions and command execution rights to other users under UNIX and Linux operating systems. However, I noticed something strange about sudo. When executing sudo, it will prompt for the user’s password the first time, but sudo no longer requires a password anymore when re-executing it. Why? Is this is a security risk?

sudo: Sorry, you must have a tty to run sudo Error on a Linux and Unix

Posted on in Categories , , , last updated October 20, 2015

I‘m trying to run the following command:

ssh [email protected] sudo command1 /path/to/file

But, an error is displayed follows:

sudo: sorry, you must have a tty to run sudo

How do I fix this problem on Linux or Unix based systems?