Fortune (Unix)

Short description: Unix command to print a random message

fortuneOriginal author(s)| Ken Arnold

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Initial release| 1979; 47 years ago (1979)
Written in| C
Operating system| Unix, Unix-like, Plan 9, Inferno
Type| Command
License| Plan 9: MIT License

`fortune` is a program that displays a pseudorandom message from a database of quotations that first appeared in Version 7 Unix.[1][irrelevant citation] The most common version on modern systems is the BSD `fortune`, originally written by Ken Arnold.[2] Distributions of fortune are usually bundled with a collection of themed files, containing sayings like those found on fortune cookies (hence the name), quotations from famous people, jokes, or poetry. As of November 2017, the quotations (with the exception of tips relevant to system operation) have been removed from FreeBSD entirely after user complaints regarding quotations from Adolf Hitler being contained in some of the files.[3]

`fortune` is predominantly found on Unix-like systems, but clients for other platforms also exist.[4] Often, users on text-mode Unix terminals will place this command into either their `.profile` or `.logout` files to display them at logon and logout, respectively. It is also used to generate text input for certain XScreenSaver modes. It is possible to pipe fortune into the cowsay command, to add more humor to the dialog.

## Contents

* 1 Content
* 2 Purpose
* 3 Fortune files
* 4 Common options
* 5 See also
* 6 References
* 7 External links

## Content

Most Unix systems use fortunes which are slanted heavily toward the user base of Unix, and thus contain many obscure jokes about computer science and computer programming. Other favoured sources include quotations from science fiction (Star Trek, The Cyberiad, Doctor Who, The Hitchhiker's Guide to the Galaxy, etc.), Zippy the Pinhead, and the writings of Ambrose Bierce and Dave Barry.[5] Most fortune collections also include a wide variety of more conventionally sourced quotations, jokes, and other short passages. A few distributions include "offensive" dicta, which require the `-a` or `-o` options to be passed for viewing. These fortunes often include rude humor and profanity, personal attacks, and controversial comments about religion. Sometimes they are provided by another package, however as of FreeBSD 10.0 the offensive dicta have been removed completely.[6] The exact fortunes vary between each type of Unix, however there seems to be a strong overlap between the FreeBSD and OpenBSD fortune files. The Plan 9 fortune files seem to be much shorter, with many just on 1 line, and the 'offensive' dicta is much stronger. Most Linux distributions, such as Debian (and its derivatives), choose the FreeBSD fortunes to put in their fortune packages, that can be installed through the package manager.

## Purpose

One of the included fortunes, from the "goedel" collection of fortunes about `fortune` itself, sums up the purpose of the program:

> Has anyone realized that the purpose of the fortune cookie program is to
>  defuse project tensions? When did you ever see a cheerful cookie, a
>  non-cynical, or even an informative cookie?
>  Perhaps inadvertently, we have a channel for our aggressions. This
>  still begs the question of whether[sic] the cookie releases the pressure or only
>  serves to blunt the warning signs.

>  Long live the revolution!
>  Have a nice day.

The original `fortune` program could be used for the more general task of picking up a random line from a plain-text file. The example of such use is given in the rc documentation . However, in most modern Unix systems `fortune` cannot be used this way, since they use an ad hoc file format for fortune files to allow multiline aphorisms.

## Fortune files

Conventional versions of `fortune` use two files for each quotation list: a text file with quotations, each separated by the character "%" on its own line, and a random-access data file generated by the `strfile`(1) program. Alternative implementations, including those made for display on Web pages, typically use only the text file.

## Common options

Several common options exist that change the way command-line versions of fortune behave:

Option  | Action

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`-a` | Choose from all databases, regardless of whether they are considered "offensive" or not
`-e` | Make the probability of choosing a fortune file equal to that of all other files
`-f` | Print out a list of all fortune files that would have been searched, but do not print a fortune
`-i` | When used with `-m`, make regular expression searching case-insensitive
`-l` | Use only quotations longer than the length specified with `-n`, or 160 characters if `-n` is not used
`-m [pattern]` | Print all fortunes matching the regular expression specified in `[pattern]`
`-n [length]` | Override the length used by `-l` and `-s` to determine "long" and "short" messages (default 160 characters)
`-o` | Choose only from "offensive" databases
`-s` | Use only quotations shorter than the length specified with `-n`, or 160 characters if -n is not used
`-w` | Wait for a period of time before terminating; useful for situations in which a fortune needs to be read before the screen is cleared

## See also

* QOTD

## References

1. ↑ "fortune -- Display Random Quotations". Clapper.org. http://software.clapper.org/fortune/.
2. ↑ "[base Contents of /head/usr.bin/fortune/fortune/fortune.c"] (in en). https://svnweb.freebsd.org/base/head/usr.bin/fortune/fortune/fortune.c?revision=328486&view=markup. "This code is derived from software contributed to Berkeley by Ken Arnold."
3. ↑ "[base Revision 325828"] (in en). 2017-11-14. https://svnweb.freebsd.org/base?view=revision&revision=325828.
4. ↑ "Jar of Fortune Files". http://fortunes.cat-v.org/.
5. ↑ "Debian Sources: fortune 1:1.99.1-7, "datfiles" folder". https://sources.debian.org/src/fortune-mod/1:1.99.1-7/datfiles/.
6. ↑ "Fortune - removal log". FreeBSD. 2013-03-12. https://svnweb.freebsd.org/base/head/usr.bin/fortune/datfiles/Makefile?view=log.

## External links

* `fortune(1)` – Plan 9 Programmer's Manual, Volume 1
* `fortune(6)` – Linux Games Manual
* A PHP version of the fortune program
* The manual page for the original Unix fortune(6) command.
* Maintenance version of fortune-mod's source code \- on GitHub with new releases
* ftp://ftp.ibiblio.org/pub/linux/games/amusements/fortune/ – source code for fortune-mod program
* A wiki containing all of the original non offensive fortunes
* A modern, color-terminal oriented fortune database
* A fortune-mod add on for math-related fortunes
* A portable and full implementation in Python, distributed with all the classical and historical cookie files

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