Ubuntu is a popular distributions used by a lot of companies as Desktop and Server. As a system administrator one of the most recurring job is changing existing user group. In this tutorial we will look how to accomplish this task and some helper commands about this. Primary Group Primary...
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by İsmail Baydan · Published 12/02/2018
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...
Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu
by İsmail Baydan · Published 27/07/2017
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.
1 | chroot OPTION NEWROOT COMMAND |
OPTION is chroot...
Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu
by İsmail Baydan · Published 18/06/2017 · Last modified 22/04/2018
chown command is used to change file and folders user , group and other ownership. chown is very useful tool but sometimes becomes very dangerous because it can harm current owner policy.chown mainly changes read , write and execute owner according to given user or group. Syntax Syntax of chown is like below.
1 | chown OPTIONS USER:GROUP FILE |
List User and...
Blog / CentOS / Debian / Fedora / Kali / Linux / Linux / Mint / RedHat / Security / Ubuntu
by İsmail Baydan · Published 16/06/2017 · Last modified 25/03/2018
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...
Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu
by İsmail Baydan · Published 27/05/2017
Linux operating system have users to operate applications, services and other stuff. Multiple users can be interact with Linux and we call it multi-user. It may be ridiculous but long time ago operating systems was single user. Which means to work on a system other users should sign out. Now...
Blog / Kali / Linux / Linux / Network / Pentest / Security / System / Windows
by İsmail Baydan · Published 14/05/2017
Kali is a Linux distribution or it is a security and penetration test distribution. It is beyond a Linux distribution and provides a lot of useful, popular and featureful tools to the security professionals. Some of popular tools Kali provides nmap metasploit burp sqlmap masscan nikto … Download Kali We...
Blog / CentOS / Debian / Fedora / Linux / Mint / Network / Network / RedHat / Security / Security / System / Ubuntu
by İsmail Baydan · Published 14/03/2017
Secure Shell or with its most know name SSH is a protocol developed to connect IT systems remotely and securely. SSH works as expected client server architecture. In this post we will look various security related configuration options of the SSH daemon service or sshd. The tutorial about the client side...
Blog / CentOS / Debian / Fedora / Linux / Linux / RedHat / Security / Ubuntu
by İsmail Baydan · Published 14/03/2017
access.conf is the configuration file used to logins to the Linux or Unix systems. This file is locate at /etc/security/ path. With this file logins of users, groups, hosts, tty, network are defined to allows or disallowed status. Each line specifies a rule. Help Syntax
1 | permission:users/groups:origins |
Show Services Using Access.conf Allow Rule...
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by İsmail Baydan · Published 12/11/2016 · Last modified 07/03/2018
The su short for substitute user command using to change currently logged user. This makes things practical because the user change made without login. Su command can be used to get root privileges too. Su and sudo commands have different ways to act for similar aims. Syntax
1 | su [options] [commands] [-] [username] |
Man Man page...
