SS command is part of the iproute2 (utilities for controlling TCP/IP networking and traffic) package. iproute2 is intended to replace an entire suite of standard Unix networking tools (often called "net-tools") that were previously used for the tasks of configuring [...]
Systemd is the new init system, starting with Fedora and now adopted in many distributions like RedHat, Suse and Centos. Historically, most of us have been using traditional SysV init scripts normally residing in /etc/rc.d/init.d/. These scripts invoke a daemon [...]
Systemd is a service manager suitable for any Linux Distribution like Ubuntu/Centos. It is a replacement for init system and can manage system startup and services. It starts up and supervises the entire system. In this tutorial, I will show [...]
The strace is the tool that helps in debugging issues by tracing system calls executed by a program. It is handy when you want to see how the program interacts with the operating system, like what system calls are executed [...]
You have probably needed to change the hostname of your CentOS 7 install for one reason or the other. Changing the hostname in CentOS 7 is now much simpler than ever. If you are ready open up your terminal and [...]
One of the major changes in RHEL / CentOS 7.0 is the swtich to systemd, a system and service manager, that replaces SysV and Upstart used in previous releases of Red Hat Enterprise Linux. systemd is compatible with SysV and [...]
If you have been in the IT world for quite some time you probably have heard about SSH, how great a tool it is and all its cool security features. In this tutorial you will learn how to use SSH [...]
How to merge two directory trees with similar layout into a third directory?. Let us consider the following example to understand the problem. Suppose two directories dir1 and dir2 have 3 sub-directories a, b and c in each of them. [...]
The Linux kernel needs to allocate memory for temporary objects such as task or device structures and inodes. The caching memory allocator manages caches of these types of objects. The modern Linux kernel implements this caching memory allocator to hold [...]
Creating users and managing passwords is one of the primary responsibilities of a system administrator. A good policy requires modification of passwords on regular intervals. But changing the passwords for a number of users with passwd command becomes difficult. In [...]
Directory navigation is one of the most basic concepts when it comes to understanding any command line system. Although it's not a very difficult thing to understand when it comes to Linux, there are certain tips and tricks that can [...]
Lsblk command in linux is used to list information about all available block devices, however, it does not list information about RAM disks. Examples of block devices are a hard disk, flash drives, CD-ROM e.t.c Install lsblk The command lsblk [...]
This script command is very helpful for system admin. If any problem occurs to the system, it is very difficult to find what command was executed previously. Hence, system admin knows the importance of this script command. Sometimes you are on [...]
The linux ip command is similar to ifconfig, but more powerful and is intended to be a replacement for it. With ip you have the advantage of performing several network administration tasks with only one command. ifconfig is one of the [...]