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The man command is used to view a system’s reference manuals(man pages). The command gives users access to manual pages for command-line utilities and tools. Here is the example output for man ftp that explains the usage of ftp command. type q to exit from the manual screen Each manual page is divided into sections: NAME, SYNOPSIS, CONFIGURATION,… Continue reading linux man command (manual)
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The basic syntax of the LS command is as follows: The LS -l command lists files and directories together with additional information like permissions, owner, date of creation, etc. Let’s look at the image below before getting to every column and data presented. A common variation is the ls -ltr. It is used with file… Continue reading linux ls command
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The ps command in Linux is used to display about running processes on the system. You can get information like process ID (PID) for the processes you or any other user is running on the same Linux system. The x option (Note: no hyphen) will display all the processes even if they are not associated… Continue reading ps command Linux
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Putty is the most popular tool to connect to the Linux server. Putty is a very simple application interface that can open different port connections. Download Putty from https://putty.en.softonic.com/ or Get Putty (Unofficial) – Microsoft Store Click on the icon and enter the connection properties. enter the address and port (most commonly 22) Click on… Continue reading Tools to connect to Linux from Windows (Putty and MobaXterm)
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In this tutorial, you will learn- What is the VI editor? Command mode Insert mode Starting the vi editor vi Editing commands Moving within a file Saving and Closing the file What is the VI editor? The VI editor is the most popular and classic text editor in the Linux family. Below, are some reasons which make it a widely used editor – It is available in almost all Linux Distributions It works the same across different platforms and Distributions It is user-friendly. Hence, millions of Linux users love it and use it for their editing needs Nowadays, there are advanced versions of the vi editor available, and the most popular one is VIM which is Vi Improved. Some of the other ones are Elvis, Nvi, Nano, and Vile. It is wise to learn vi because it is feature-rich and offers endless possibilities to edit a file. To work on VI editor, you need to understand its operation modes. They can be divided into two main parts. Click here if the video is not accessible Command mode: The vi editor opens in this mode, and it only understands commands In this mode, you can, move the cursor and cut, copy, paste the text This mode also saves the changes you have made to the file Commands are case sensitive. You should use the right letter case. Insert mode: This mode is for inserting text in the file. You can switch to the Insert mode from the command mode by pressing ‘i’ on the keyboard Once you are in Insert mode, any key would be taken as an input for the file on which you are currently working. To return to the command mode and save the changes you have made you need to press the Esc key Starting the vi editor To launch the VI Editor -Open the Terminal (CLI) and type vi
3dd Delete line
Delete 3 lines. D Delete contents of line after the cursor C Delete contents of a line after the cursor and insert new text. Press ESC key to end insertion. dw
4dw Delete word
Delete 4 words cw Change word x Delete character at the cursor r Replace character R Overwrite characters from cursor onward s Substitute one character under cursor continue to insert S Substitute entire line and begin to insert at the beginning of the line ~ Change case of individual character Make sure you press the right command otherwise you will end up making undesirable changes to the file. You can also enter the insert mode by pressing a, A, o, as required. Moving within a file You need to be in the command mode to move within a file. The default keys for navigation are mentioned below else; You can also use the arrow keys on the keyboard. Keystroke Use k Move cursor up j Move cursor down h Move cursor left l Move cursor right Saving and Closing the file You should be in the command mode to exit the editor and save changes to the file. Keystroke Use Shift+zz Save the file and quit :w Save the file but keep it open :q Quit without saving :wq Save the file and quit Summary: The vi editor is the most popular and commonly used Linux text editor It is usually available in all Linux Distributions. It works in two modes, Command and Insert Command mode takes the user commands, and the Insert mode is for editing text You should know the commands to work on your file easily Learning to use this editor can benefit you in creating scripts and editing files.
