calendar

The "calendar" command line tool is a built-in utility in some Unix-like operating systems, including Linux and macOS. It allows users to display a textual calendar for a specific month or year directly in the terminal.

By default, running "calendar" without any arguments will display the calendar for the current month. However, you can specify a different month and year using command-line options. For example, "calendar 05 2022" will display the calendar for May 2022.

The calendar utility also supports additional options to customize the output. Some common options include:

• "-A num": Display the specified number of months after the requested month.
• "-B num": Display the specified number of months before the requested month.
• "-y": Display a calendar for the entire year.
• "-j": Display the Julian calendar.
• "-w": Display the week number for each week.
• "-s": Start the week on Sunday rather than Monday.

The output of the calendar command can be redirected to a file or piped to another command for further processing. It can be useful for quickly checking a date or planning events without the need for a graphical user interface.