aliases (Postfix local alias database format) Manual page. The aliases(5) table provides a system-wide mechanism for redirecting mail to local recipients. Redirects are handled by the Postfix local(8) delivery agent. Aliases allow users to refer to other users, addresses, or groups within the Postfix system using abbreviations.

Postfix local(8) is a built-in local delivery agent that is part of Postfix. This local delivery agent is a daemon that starts based on Postfix's configuration and delivers mail received by Postfix to local user mailboxes, which by default are located in /var/mail/, or /var/spool/mail/ are found in the library.

The manual page and help for the mc Linux command. mc (Midnight Commander) is a feature-rich two-panel text mode file management program that effectively helps Linux users with their command line work.

The manual page and help for the ipcalc Linux command. The ipcalc command can be used to find out information about IP addresses and subnet masks. Based on the specified IP address or subnet mask, the ipcalc command determines the class of the IP address, the network ID, the subnet mask, the number of free IP addresses, the broadcast IP address of the network, and the first/last usable IP address. addresses.
To use the command on Debian/Ubuntu systems, the ipcalc package must be installed.

The jq Linux command manual page and help. The jq command is a utility for parsing, processing, and manipulating JSON files.

Manual page and help for the ifdown Linux command. The ifdown command disables the specified network interface.

The manual page and help for the ifup Linux command. The ifup command enables the specified network interface.

Manual page and help for the id Linux command. The id command provides information about the given user or about the person running the program if no user is specified.

The monit Linux command manual page and help. Monit is a utility for managing and monitoring processes, programs, files, directories and file systems on Unix/Linux systems. Monit performs automatic maintenance and repair and can perform meaningful cause-effect actions in error situations. For example, Monit can start a process if it is not running, restart a process if it is not responding, and kill a process if it is using too many resources.

Help for the acme.sh Linux command. The acme.sh command is a shell script-based ACME client that can be used to request SSL certificates for websites. The program is very flexible and supports several CA (Certificate Authorities), including Let's Encrypt, which also issues free certificates, which makes it very popular.