The manual page and help for the su command. The command starts a shell with another user and group ID

The manual page and help for the aptitude command. As the frontend of the APT package manager, it efficiently manages distribution packages using a text-mode interface or command line usage.

The manual page and help for the mkdir command. Use this command to create directories.

The manual page and help for the chgrp command. Use this command to change the ownership group of files.

The manual page and help for the nproc command. Use this command to query the number of processing units available for the current process.

The manual page and help for the shopt built-in command. With the shopt command you can control how Bash works by adjusting various options ...

The manual page and help for the apache2ctl command. As the frontend of the Apache HTTP (HyperText Transfer Protocol) server, we can give different commands to the web server.

Manual page and help for the xhost command. You can use the xhost program to add or remove server names or user names from the list that allows you to connect to the X server. For servers, this provides a simple form of privacy control and security. Although this is limited to the workstation (single user) environment, it prevents abuse. In environments that require more sophisticated security, a user-based mechanism must be implemented or hooks in the protocol must be used to transmit other credentials to the server.

The manual page for the a2enmod command. Use this command to enable Apache2 modules ...

The manual page for the a2dismod linux command. Use this command to disable Apache 2 modules ...