sudo or superuser do is a utility used on Linux, BSD and Unix systems that provides the running command with root or Administrator privileges. Not every user needs to have root privileges but in some cases needs to run commands with root privileges. We can use sudo to run some specific or all provided commands and edit files with the root privileges. sudo Configuration File sudoers sudo command is configuration...
Linux provides root account as superuser or Administrator. As root account has all privileges to manage a system this may be a threat for misuse or error of administrators. We generally use normal user accounts in daily operation and change to the superuser with su command. Root root exist all Linux systems and can not be deleted because of Linux privileges administration logic. root user has special home directory located /root and other users can...
sudo command is used to execute command as another user. This is generally used to run command as root. In some cases we can get an error like -bash:sudo:command not found which means sudo is not installed. In this tutorial we will look different ways and distributions to solve this problem. Install Sudo For Debian, Ubuntu, Mint, Kali We can install sudo for Debian, Ubuntu, Mint and Kali related distributions for deb or apt with...
We have examined the apt-get and its sub commands in a detailed manner previously. apt-get is used to manage installed packages in a Linux distribution like Ubuntu, Debian, Mint, Kali etc. Here we will look simply sudo apt-get update and related commands to update a deb based Linux distribution. For detailed tutorials look following. How To Apt-Get Update, Upgrade, Dist-Upgrade, Full-Upgrade and Their Similarities and Diffirencies How To Install Updates...
CentOS is enterprise level Linux distribution which is clone of the RedHat. User management like create, add, remove etc is important part of the daily Administration tasks. In this tutorial we will look how to add new user to the CentOS system. List Current Users Before creating new user we will list existing users. We can use different methods to list existing users but following is the most practical way...
When we connect to our Linux systems like Ubuntu, Debian, Mint and Kali we see that there is a notification like below. This notification says that we hve new updates and we need to install them. Some of the updates are bug fix and some of the are security update. We will look how to install them. More information about apt can be found int the following tutorial. Apt and Apt-Get...
Linux provides different mechanisms for practical and security reasons. chroot is one of them. Processes in linux can access to the file system or root by default. Linux kernel also provides chroot mechanism to restrict access to the whole filesystem in Linux. Syntax The chroot syntax is like below.
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chroot OPTION NEWROOT COMMAND |
OPTION is chroot option NEWROOT is the new root directory COMMAND is the command we want to run in the chrooted directory Chroot Jail or...
chmod 777 is very popular ownership command. 777 simply means give all rights to the all users. chmod 777 generally used to make operations more smoothly because it will remove all ownership related problems. We generally use chmod 777 some error message like below.
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You don't have permission to access /bin/ on this server. |
All Files and Directories Recursively One of the most popular use case for chmod 777 is changing given directory and child directories permission recursively. We can use -R option for this....
Linux sudo command is used to give root privileges to the normal users . /etc/sudoers file is used for configuration of sudo . Sudoers file provides the users who can run sudo command. Sudoers also used to limit the commands the user can run. Run Command With Sudo Sudo command will accept given command and look to the sudoers file. If the given user have right to run command with sudo the password will be...
Every system admin horror is deleting files accidentally especially important and not backup ed configuration files. Here is how can we recover deleted files from Linux systems which is next situation if we skipped this step. Ask Before Deleting Files rm is defacto tool to remove files from Linux system. We can setup a mechanism to ask before deleting files with simple alias setup like below.
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$ echo 'alias rm=rm -i' >> .bashrc |
This will add new...
