The “which” command in Linux/Unix is used to determine the location of executable files in the system PATH. Here are some examples of using the “which” command: Find the location of a specific program: which program-name Replace “program-name” with the actual name of the program you want to find. Find the location of multiple programs: … Read more

You can display line numbers in Vim by adding the following line to your .vimrc file: set number The .vimrc file is a configuration file for Vim, and any settings specified in this file will be applied every time you start Vim. Once you have added the above line to your .vimrc file, you can … Read more

To quit the Vim editor without saving changes, you can use the following command while in normal mode: :q! The “!” forces the quit without saving any changes. If you have made changes to a file in Vim and you want to exit without saving those changes, simply type the above command and press “Enter”. … Read more

The “pwdx” command in Linux/Unix is used to display the current working directory of a process. Here are some examples of using the “pwdx” command: Display the current working directory of a specific process: pwdx process-id Replace “process-id” with the actual process ID that you want to check. Display the current working directories of multiple … Read more

To determine the version of Red Hat Enterprise Linux (RHEL) you are running, you can use the following command: cat /etc/redhat-release This will display the version number of RHEL that is currently installed on your system. If you need more detailed information about your system, you can use the following command: lsb_release -a This will … Read more

To restart a named service on Ubuntu or Debian, you can use the following command: sudo systemctl restart service-name.service Replace “service-name” with the actual name of the service you want to restart. For example, to restart the Apache web server, you would run: sudo systemctl restart apache2.service You need to have root privileges (using “sudo”) … Read more

The “users” command in Linux/Unix is used to list the names of the users who are currently logged into the system. Here are some examples of using the “users” command: List all logged in users: users Display names of users in a specific format: users | tr ‘ ‘ ‘\n’ This will display each username … Read more

The “who” command in Linux/Unix is used to list the users who are currently logged into the system. Here are some examples of using the “who” command: List all users: who List users who are logged in to a specific terminal: who tty1 List users with their hostname: who -H List all information about users: … Read more

The “w” command in Linux/Unix displays information about the users who are currently logged into the system, and what they are doing. Here are some examples of using the “w” command: Display information about all users: w Display information about a specific user: w username Display information in a specific format: w -h The -h … Read more

The “last” command in Linux/Unix is used to display a list of recent login sessions on the system. Here are some examples of using the last command: Display a list of all login sessions: $ last Display a list of only the latest login session for each user: $ last -f /var/log/wtmp -1 Display a … Read more