Unix is a multi-user, multi-tasking operating system that was initially developed by Bell Labs in the 1970s. Various similar operating systems that are POSIX compliant (ie compatible with Unix) have since been developed (POSIX is an abbreviation for Portable Operating System Interface for UNIX). These include the following: the BSD family (OpenBSD, FreeBSD, NetBSD, Mac OS/X), Solaris, IRIX, AIX, SunOS, UnixWare, OpenServer and Linux.
Software written for POSIX compliant operating systems is generally able to be compiled for all POSIX platforms with little or no platform-specific changes. This makes the commands and utilities available for this extended family of operating systems very similar, and there are few differences between administering them.
The articles in this section are about useful command line utilities and commonly used application software on POSIX compliant operating systems. For Mac OSX specific articles see my OSX section.
Vim/Vi is a popular text editor for many Linux software developers and system administrators. It’s especially true if you plan to debug any program errors or improve the script or program’s overall readability. Today, we’ll teach you how to display line numbers when you use vim/vi. Show or Hide Vim Line Numbers By default, Vim/Vi …
In Linux operating systems, groups allow certain user permissions to be available for group members. For someone to access the system, one must add a user to a group in Linux. Adding users to group is a task worth learning. It can help you manage your system better as well as provide security by being …
Eventually, you will have to read and execute permission changes on either a file or directory. To do this, you need to run the chmod command. This tutorial discusses how the chmod command functions, the basic permissions, its corresponding numbers, and everything else in between. What are chmod commands? Chmod means change mode. This enables …
Operating a Linux screen requires the mastery of varying technical terms and skills. Copying directories on Linux is no different. It is the most frequent task you will perform on the command line. So how exactly do you copy a directory in Linux? This tutorial will show you how to copy files and directories in …
The Linux system is an application where multiple people can simultaneously link into the same system. As the system administrator, it falls to you to manage the system’s groups and users. This article discusses how to create new user accounts with the useradd command. Useradd Command -Functions This is used to create user accounts in Linux. It also …
What is the importance of learning how to add user to sudoers? For one, it’s to grant elevated access or permission to a user so that the user can carry unique functions that standard users would not have access to. These include sensitive tasks such as viewing the contents found in your root directory, for …
