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Linux user management through command line and GUI
In one of the earlier articles at this blog ( here ), we learned the Linux user login management. The article explained how user login and password are managed in Linux. Continuing on the same lines. In this article, we will learn how users are managed in Linux. This article will try to cover basics of Linux user management through command line tools as well as through GUI. Note that since I work on Linux Mint so the GUI part would be applicable only to the Linux debain distributions. Command Line tools for Linux user / group management ... [More]
Tags: user usermod management userdel useradd |
The Linux user login management (/etc/passwd and /etc/shadow files)
Have you ever thought what happens behind the doors when a user login happens in Linux? Where is the login information for a user is kept in Linux and how the validation of user credential takes place? Well, if not, then I would suggest you to read on as in this article we will discuss how user login management and validation takes place in Linux.
The /etc/passwd file Well, this is the file in Linux system that contains all the relevant information related to user login. If we peek inside this file, this is what it looks like on my Linux... [More]
Tags: login passwd user shadow linux encryption |
Linux system calls
Any application running on Linux may request services like :
Inter process communication I/O services Creating a new process Accessing system hardware etc
Note: The above list is not exhaustive.
The services listed above are all handled by Linux kernel. So, any application in Linux that requires any of these services has to request the Linux kernel to handle the request on its behalf. The request is handed over to kernel by calling corresponding system calls. System calls act as an interface between application and kernel.
Some... [More]
Tags: system kernel 0x80 mode user linux calls |
