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From Brian Behlendorf <br...@organic.com>
Subject The Tao of Programming (fwd)
Date Thu, 20 Feb 1997 05:52:01 GMT

Apologies if you consider this spamming or too irrelevant, but I thought it was
entertaining, with some pretty worthwhile koans.

	Brian

################


The Tao Of Programming

Translated by Geoffrey James

Table of Contents

       Book 1 -- The Silent Void
       Book 2 -- The Ancient Masters
       Book 3 -- Design
       Book 4 -- Coding
       Book 5 -- Maintenance
       Book 6 -- Management
       Book 7 -- Corporate Wisdom
       Book 8 -- Hardware and Software
       Book 9 -- Epilogue


Book 1 -- The Silent Void


Thus spake the master programmer:

	"When you have learned to snatch the error code from the trap
frame, it will be time for you to leave."


1.1

Something mysterious is formed, born in the silent void. Waiting alone and
unmoving, it is at once still and yet in constant motion. It is the source
of all programs. I do not know its name, so I will call it the Tao of
Programming.

If the Tao is great, then the operating system is great. If the operating
system is great, then the compiler is great. If the compiler is great, then
the application is great. The user is pleased and there exists harmony in
the world.

The Tao of Programming flows far away and returns on the wind of morning.


1.2

The Tao gave birth to machine language. Machine language gave birth to the
assembler.

The assembler gave birth to the compiler. Now there are ten thousand languages.

Each language has its purpose, however humble. Each language expresses the
Yin and Yang of software. Each language has its place within the Tao.

But do not program in COBOL if you can avoid it.


1.3

In the beginning was the Tao. The Tao gave birth to Space and Time.
Therefore Space and Time are Yin and Yang of programming.

Programmers that do not comprehend the Tao are always running out of time
and space for their programs. Programmers that comprehend the Tao
always have enough time and space to accomplish their goals.

How could it be otherwise?


1.4

The wise programmer is told about Tao and follows it. The average
programmer is told about Tao and searches for it. The foolish programmer is
told about Tao and laughs at it.

If it were not for laughter, there would be no Tao.

The highest sounds are hardest to hear. Going forward is a way to retreat.
Great talent shows itself late in life. Even a perfect program still has
bugs.



Book 2 -- The Ancient Masters

Thus spake the master programmer:

	"After three days without programming, life becomes meaningless."


2.1

The programmers of old were mysterious and profound. We cannot fathom their
thoughts, so all we do is describe their appearance.

Aware, like a fox crossing the water. Alert, like a general on the
battlefield. Kind, like a hostess greeting her guests. Simple, like
uncarved blocks of wood. Opaque, like black pools in darkened caves.

Who can tell the secrets of their hearts and minds?

The answer exists only in Tao.


2.2

Grand Master Turing once dreamed that he was a machine. When he awoke he
exclaimed:

       "I don't know whether I am Turing dreaming that I am a machine, or a
machine dreaming that I am Turing!."


2.3

A programmer from a very large computer company went to a software
conference and then returned to report to his manager, saying: "What sort
of programmers work for other companies? They behaved badly and were
unconcerned with appearances. There hair was long and unkempt and their
clothes were wrinkled and old. They crashed our hospitality suite and they
made rude noises during my presentation."

The manager said: "I should have never sent you to the conference. Those
programmers live beyond the physical world. They consider life absurd, an
accidental coincidence. They come and go without knowing limitations.
Without a care, they live only for their programs. Why should they bother
with social conventions?

They are alive within the Tao."


2.4

A novice asked the Master: "Here is a programmer that never designs,
documents or tests his programs. Yet all who know him consider him one of
the best programmers in the world. Why is this?"

The Master replies: "That programmer has mastered the Tao. He has gone
beyond the need for design; he does not become angry when the system
crashes, but accepts the universe without concern. He has gone beyond the
need for documentation; he no longer cares if anyone else sees his code. He
has gone beyond the need for testing; each of his programs are perfect
within themselves, serene and elegant, their purpose self-evident. Truly,
he has entered the mystery of Tao."



Book 3 -- Design

Thus spake the master programmer:

	"When the program is being tested, it is too late to make design
changes."


3.1

There once was a man who went to a computer trade show. Each day as he
entered, the man told the guard at the door:

       "I am a great thief, renowned for my feats of shoplifting. Be
forewarned, for this trade show shall not escape unplundered."

This speech disturbed the guard greatly, because there were millions of
dollars of computer equipment inside, so he watched the man carefully. But
the man merely wandered from booth to booth, humming quietly to himself.

When the man left, the guard took him aside and searched his clothes, but
nothing was to be found.

On the next day of the trade show, the man returned and chided the guard
saying: "I escaped with a vast booty yesterday, but today will be even
better." So the guard watched him ever more closely, but to no avail.

On the final day of the trade show, the guard could restrain his curiosity
no longer. "Sir Thief," he said, "I am so perplexed, I cannot live in
peace.  Please enlighten me. What is it that you are stealing?"

The man smiled. "I am stealing ideas," he said.


3.2

There once was a master programmer who wrote unstructured programs. A
novice programmer, seeking to imitate him, also began to write
unstructured programs. When the novice asked the master to evaluate his
progress, the master criticized him for writing unstructured programs,
saying, "What is appropriate for the master is not appropriate for the
novice. You must understand the Tao before transcending structure."


3.3

There was once a programmer who was attached to the court of the warlord of
Wu. The warlord asked the programmer: "Which is easier to design: an
accounting package or an operating system?"

"An operating system," replied the programmer.

The warlord uttered an exclamation of disbelief. "Surely an accounting
package is trivial next to the complexity of an operating system," he said.

"Not so," said the programmer, "when designing an accounting package, the
programmer operates as a mediator between people having different ideas:
how it must operate, how its reports must appear, and how it must conform
to the tax laws. By contrast, an operating system is not limited by outside
appearances. When designing an operating system, the programmer seeks the
simplest harmony between machine and ideas. This is why an operating system
is easier to design."

The warlord of Wu nodded and smiled. "That is all good and well, but which
is easier to debug?"

The programmer made no reply.


3.4

A manager went to the master programmer and showed him the requirements
document for a new application. The manager asked the master: "How
long will it take to design this system if I assign five programmers to it?"

"It will take one year," said the master promptly.

"But we need this system immediately or even sooner! How long will it take
if I assign ten programmers to it?"

The master programmer frowned. "In that case, it will take two years."

"And what if I assign a hundred programmers to it?"

The master programmer shrugged. "Then the design will never be completed."



Book 4 -- Coding

Thus spake the master programmer:

	"A well-written program is its own heaven; a poorly-written program
is its own hell."


4.1

A program should be light and agile, its subroutines connected like a
string of pearls. The spirit and intent of the program should be retained
throughout. There should be neither too little or too much, neither
needless loops nor useless variables, neither lack of structure nor
overwhelming rigidity.

A program should follow the `Law of Least Astonishment'. What is this law?
It is simply that the program should always respond to the user in the way
that astonishes him least.

A program, no matter how complex, should act as a single unit. The program
should be directed by the logic within rather than by outward
appearances.

If the program fails in these requirements, it will be in a state of
disorder and confusion. The only way to correct this is to rewrite the
program.


4.2

A novice asked the master: "I have a program that sometime runs and
sometimes aborts. I have followed the rules of programming, yet I am totally
baffled. What is the reason for this?"

The master replied: "You are confused because you do not understand Tao.
Only a fool expects rational behavior from his fellow humans. Why do you
expect it from a machine that humans have constructed? Computers simulate
determinism; only Tao is prefect.

The rules of programming are transitory; only Tao is eternal. Therefore you
must contemplate Tao before you receive enlightenment."

"But how will I know when I have received enlightenment?" asked the novice.

"Your program will then run correctly," replied the master.


4.3

A master was explaining the nature of Tao of to one of his novices, "The
Tao is embodied in all software -- regardless of how insignificant," said
the master.

"Is the Tao in a hand-held calculator?" asked the novice.

"It is," came the reply.

"Is the Tao in a video game?" continued the novice.

"It is even in a video game," said the master.

"And is the Tao in the DOS for a personal computer?"

The master coughed and shifted his position slightly. "The lesson is over
for today," he said.


4.4

Prince Wang's programmer was coding software. His fingers danced upon the
keyboard. The program compiled without an error message, and the
program ran like a gentle wind.

"Excellent!" the Prince exclaimed, "Your technique is faultless!"

"Technique?" said the programmer turning from his terminal, "What I follow
is Tao -- beyond all techniques! When I first began to program I would see
before me the whole problem in one mass. After three years I no longer saw
this mass. Instead, I used subroutines. But now I see nothing. My whole
being exists in a formless void. My senses are idle. My spirit, free to
work without plan, follows its own instinct. In short, my program writes
itself. True, sometimes there are difficult problems. I see them coming, I
slow down, I watch silently. Then I change a single line of code and the
difficulties vanish like puffs of idle smoke. I then compile the program. I
sit still and let the joy of the work fill my being. I close my eyes for a
moment and then log off."

Prince Wang said, "Would that all of my programmers were as wise!"



Book 5 -- Maintenance

Thus spake the master programmer:

	"Though a program be but three lines long, someday it will have to
be maintained."


5.1

A well-used door needs no oil on its hinges.
A swift-flowing stream does not grow stagnant.
Neither sound nor thoughts can travel through a vacuum.
Software rots if not used.

These are great mysteries.


5.2

A manager asked a programmer how long it would take him to finish the
program on which he was working. "It will be finished tomorrow," the
programmer promptly replied.

"I think you are being unrealistic," said the manager, "Truthfully, how
long will it take?"

The programmer thought for a moment. "I have some features that I wish to
add. This will take at least two weeks," he finally said.

"Even that is too much to expect," insisted the manager, "I will be
satisfied if you simply tell me when the program is complete."

The programmer agreed to this.

Several years later, the manager retired. On the way to his retirement
luncheon, he discovered the programmer asleep at his terminal. He had been
programming all night.


5.3

A novice programmer was once assigned to code a simple financial package.

The novice worked furiously for many days, but when his master reviewed his
program, he discovered that it contained a screen editor, a set of
generalized graphics routines, an artificial intelligence interface, but
not the slightest mention of anything financial.

When the master asked about this, the novice became indignant. "Don't be so
impatient," he said, "I'll put in the financial stuff eventually."


5.4

Does a good farmer neglect a crop he has planted? Does a good teacher
overlook even the most humble student? Does a good father allow a single
child to starve? Does a good programmer refuse to maintain his code?



Book 6 -- Management

Thus spake the master programmer:

	"Let the programmers be many and the managers few -- then all will
be productive."


6.1

When managers hold endless meetings, the programmers write games. When
accountants talk of quarterly profits, the development budget is about to
be cut. When senior scientists talk blue sky, the clouds are about to roll
in.

Truly, this is not the Tao of Programming.

When managers make commitments, game programs are ignored. When accountants
make long-range plans, harmony and order are about to be
restored. When senior scientists address the problems at hand, the problems
will soon be solved.

Truly, this is the Tao of Programming.


6.2

Why are programmers non-productive?
Because their time is wasted in meetings.

Why are programmers rebellious?
Because the management interferes too much.

Why are the programmers resigning one by one?
Because they are burnt out.

Having worked for poor management, they no longer value their jobs.


6.3

A manager was about to be fired, but a programmer who worked for him
invented a new program that became popular and sold well. As a result, the
manager retained his job.

The manager tried to give the programmer a bonus, but the programmer
refused it, saying, "I wrote the program because I thought it was an
interesting concept, and thus I expect no reward."

The manager upon hearing this remarked, "This programmer, though he holds a
position of small esteem, understands well the proper duty of an
employee. Let us promote him to the exalted position of management consultant!"

But when told this, the programmer once more refused, saying, "I exist so
that I can program. If I were promoted, I would do nothing but waste
everyone's time. Can I go now? I have a program that I'm working on."


6.4

A manager went to his programmers and told them: "As regards to your work
hours: you are going to have to come in at nine in the morning and leave at
five in the afternoon." At this, all of them became angry and several
resigned on the spot."

So the manager said: "All right, in that case you may set your own working
hours, as long as you finish your projects on schedule." The programmers,
now satisfied, began to come in at noon and work to the wee hours of the
morning.



Book 7 -- Corporate Wisdom

Thus spake the master programmer:

	"You can demonstrate a program for a corporate executive, but you
can't make him computer literate."


7.1

A novice asked the master: "In the east there is a great tree- structure
that men call `Corporate Headquarters'. It is bloated out of shape with
vice presidents and accountants. It issues a multitude of memos, each
saying `Go, Hence!' or `Go, Hither!' and nobody knows what is meant. Every
year new names are put onto the branches, but all to no avail. How can such
an unnatural entity be?"

The master replied: "You perceive this immense structure and are disturbed
that it has no rational purpose. Can you not take amusement from its
endless gyrations? Do you not enjoy the untroubled ease of programming
beneath its sheltering branches? Why are you bothered by its uselessness?"


7.2

In the east there is a shark which is larger than all other fish. It
changes into a bird whose wings are like clouds filling the sky. When this
bird moves
across the land, it brings a message from Corporate Headquarters. This
message it drops into the midst of the programmers, like a seagull making
its mark upon the beach. Then the bird mounts on the wind and, with the
blue sky at its back, returns home.

The novice programmer stares in wonder at the bird, for he understands it
not. The average programmer dreads the coming of the bird, for he fears its
message. The master programmer continues to work at his terminal, for he
does not know that the bird has come and gone.


7.3

The Magician of the Ivory Tower brought his latest invention for the master
programmer to examine. The magician wheeled a large black box into the
master's office while the master waited in silence.

"This is an integrated, distributed, general-purpose workstation," began
the magician, "ergonomically designed with a proprietary operating system,
sixth generation languages, and multiple state of the art user interfaces.
It took my assistants several hundred man years to construct. Is it not
amazing?"

The master raised his eyebrows slightly. "It is indeed amazing," he said.

"Corporate Headquarters has commanded," continued the magician, "that
everyone use this workstation as a platform for new programs. Do you agree
to this?"

"Certainly," replied the master, "I will have it transported to the data
center immediately!" And the magician returned to his tower, well pleased.

Several days later, a novice wandered into the office of the master
programmer and said, "I cannot find the listing for my new program. Do you
know where it might be?"

"Yes," replied the master, "the listings are stacked on the platform in the
data center."


7.4

The master programmer moves from program to program without fear. No change
in management can harm him. He will not be fired, even if the
project is cancelled. Why is this? He is filled with Tao.



Book 8 -- Hardware and Software

Thus spake the master programmer:

	"Without the wind, the grass does not move. Without software,
hardware is useless."


8.1

A novice asked the master: "I perceive that one computer company is much
larger than all others. It towers above its competition like a giant among
dwarfs. Any one of its divisions could comprise an entire business. Why is
this so?"

The master replied, "Why do you ask such foolish questions? That company is
large because it is large. If it only made hardware, nobody would buy
it. If it only made software, nobody would use it. If it only maintained
systems, people would treat it like a servant. But because it combines all
of these things, people think it one of the gods! By not seeking to strive,
it conquers without effort."


8.2

A master programmer passed a novice programmer one day. The master noted
the novice's preoccupation with a hand-held computer game. "Excuse
me," he said, "may I examine it?"

The novice bolted to attention and handed the device to the master. "I see
that the device claims to have three levels of play: Easy, Medium and
Hard," said the master. "Yet every such device has another level of play,
where the device seeks not to conquer the human, nor to be conquered by the
human."

"Pray, great master," implored the novice, "how does one find this
mysterious settings?"

The master dropped the device to the ground and crushed it under foot. And
suddenly the novice was enlightened.


8.3

There was once a programmer who worked upon microprocessors. "Look at how
well off I am here," he said to a mainframe programmer who came to
visit, "I have my own operating system and file storage device. I do not
have to share my resources with anyone. The software is self- consistent
and easy-to-use. Why do you not quit your present job and join me here?"

The mainframe programmer then began to describe his system to his friend,
saying "The mainframe sits like an ancient sage meditating in the midst of
the data center. Its disk drives lie end-to-end like a great ocean of
machinery. The software is as multifaceted as a diamond, and as convoluted
as a primeval jungle. The programs, each unique, move through the system
like a swift-flowing river. That is why I am happy where I am."

The microcomputer programmer, upon hearing this, fell silent. But the two
programmers remained friends until the end of their days.


8.4

Hardware met Software on the road to Changtse. Software said: "You are Yin
and I am Yang. If we travel together we will become famous and earn
vast sums of money." And so the set forth together, thinking to conquer the
world.

Presently they met Firmware, who was dressed in tattered rags and hobbled
along propped on a thorny stick. Firmware said to them: "The Tao lies
beyond Yin and Yang. It is silent and still as a pool of water. It does not
seek fame, therefore nobody knows its presence. It does not seek fortune,
for it is complete within itself. It exists beyond space and time."

Software and Hardware, ashamed, returned to their homes.



Book 9 -- Epilogue

Thus spake the master programmer:

	"It is time for you to leave."


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