Lesson plan
Cal (command)
is a shell command that prints a calendar as ASCII text for one or more months. With no command-line options, it prints a calendar for the current month. It is specified in the Single UNIX Specification and available on various operating systems including Unix, Plan 9, Inferno and Unix-like systems such as Linux. It was present in 1st Edition Unix. A cal command is also part of ASCII's MSX-DOS2 Tools for MSX-DOS version 2. It is also available for FreeDOS (developed by Charles Dye) in which it supports the Gregorian calendar (new style) and may be distributed freely, with or without source.
Article summary
is a shell command that prints a calendar as ASCII text for one or more months. With no command-line options, it prints a calendar for the current month. It is specified in the Single UNIX Specification and available on various operating systems including Unix, Plan 9, Inferno and Unix-like systems such as Linux. It was present in 1st Edition Unix. A cal command is also part of ASCII's MSX-DOS2 Tools for MSX-DOS version 2. It is also available for FreeDOS (developed by Charles Dye) in which it supports the Gregorian calendar (new style) and may be distributed freely, with or without source.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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