A command line interface or CLI is a user interface to the operating system where the user reacts to a visual prompt. You have to type a command on a particular line and the system responses back. You then need to enter one more command and the process continues.
Users, in the modern scenario, prefer using a graphical interface or GUI offered by most of the operating systems like Windows, Mac OS, etc. On the other hand UNIX offers both the command line and graphical interface. If you are a user of Linux or OSX, you must have come across the command line which is a command to enable a feature or fix a problem.
Is It Really Necessary?
It is really easy to ignore the use of command line as GUI is sufficient for most of the users, but if you are on the pro level, you really cannot ignore it. While doing a web development, you can understand that command line is a very powerful tool. The command line helps you to do certain things automatically which otherwise you would be doing the same thing over and again.
It really doesn’t take much time to learn the command line. Spending few hours can acquaint you with all the commands of command line. Once you start you will understand that there are many such tools which work only in command line and those tools are really worth. A holder of Red Hat Certification knows the real value of Command line.
Top Three Online Resources to Learn Command Line
You can learn these command line tools by enrolling any Linux courses and can also learn it online. Few such online courses are:
- Learn the Command Line, a course offered by Codecademy which is all interactive.
- Learning the Command line from the Command line Crash Course
- A comprehensive guide for using Linux by Linux Tutorials.
Do not ignore the use of command line rather, learn it to use it.
Networking is considered as the most essential part of Linux or UNIX. A computer loaded with the free operating system Linux, is generally a part of the network with multiuser and multitasking. The main function of A System Admin is to maintain network up and run the system efficiently. It basically provides various tools and command which helps to diagnose the networking problem. Being a holder of Red Hat Certification, a system administrator is well aware of these tools and how they are used to troubleshoot the various networking problems.
Tools Related to Networking:
- ntopng: It belongs to the next generation of the command ntop. It is a network traffic probe, which highlights the network usage. It is written in a portable way so that it can be virtually run on UNIX platforms. It can be used for web interface, network traffic, geolocate hosts and also IP traffic distribution.
- Ping: It is used mainly for two purposes like ensuring whether network connection can be established and also the timing information related to the speed of connection.
- Iftop: Almost similar to top in its use it also shows a table related to current bandwidth used by the hosts. It also makes clear who is responsible for most traffic and identifies the user who causes network congestion. It answers questions to the problem of slow internet connection.
- Vn Stat: This network traffic monitor makes use of the statistics made available by the Kernel. This in turn ensures the less usage of system resources. It is console-based and ensures “light use of system resources.” It can monitor more than one interface at a time and used without root permission. For the artistic Sys Admins there is color option.
- Bmon: It is a small bandwidth monitor with various input and output modes. It helps to debug your network. It gets hold of the statistics related to the network and offers it in a user friendly way. The best part is that if required you can interact with this tool through scripting and even curser.
The Linux courses will help you to understand this networking tools with perfection.