Mercurial > docs > unix-phil
comparison unix-phil.ms @ 12:018d5f9a2993
wrote about upgrowth and survival (ch03)
| author | meillo@marmaro.de |
|---|---|
| date | Sat, 20 Feb 2010 23:54:43 +0100 |
| parents | b32a43a62cae |
| children | c665b9e7bf8a |
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| 11:b32a43a62cae | 12:018d5f9a2993 |
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| 531 when a different approach had been used. | 531 when a different approach had been used. |
| 532 | 532 |
| 533 .SH | 533 .SH |
| 534 Upgrowth and survival of software | 534 Upgrowth and survival of software |
| 535 .LP | 535 .LP |
| 536 | 536 So far it was talked about \fIwriting\fP or \fIbuilding\fP software. |
| 537 portability | 537 Although it is just a verb, it does imply a specific view on the work process |
| 538 | 538 it describes. |
| 539 The better verb, however, is to \fIgrow\fP. | |
| 540 .PP | |
| 541 Creating software in the sense of the Unix Philosophy is an incremental process. | |
| 542 It starts with a first prototype, which evolves as requirements change. | |
| 543 A quickly hacked shell script might become a large, sophisticated, | |
| 544 compiles program this way. | |
| 545 During its lifetime, it will get extended, rearranged, rebuilt (from scratch). | |
| 546 Growing software matches the view that ``software is never finished. It is only released.'' | |
| 547 .[ | |
| 548 FIXME | |
| 549 gancarz p.26 | |
| 550 .] | |
| 551 In this view, building a software is an evolutionary process; | |
| 552 it begins with the initial prototype and ends when the software is not used anymore. | |
| 553 .PP | |
| 554 Successful software is used by many for a long time. | |
| 555 This implies that the software is needed, useful, and better than alternatives. | |
| 556 Darwin talks about: ``The survival of the fittest.'' | |
| 557 .[ | |
| 558 FIXME | |
| 559 .] | |
| 560 Transferred to software: The most successful software, is the fittest, | |
| 561 is the one that survives. | |
| 562 The fitness is affected mainly by three properties: | |
| 563 .IP \(bu | |
| 564 portability of code | |
| 565 .IP \(bu | |
| 566 portability of data | |
| 567 .IP \(bu | |
| 568 range of usability | |
| 569 .IP \(bu | |
| 570 reuseability of parts | |
| 571 .LP | |
| 572 foo | |
| 573 | |
| 574 .PP | |
| 539 text files | 575 text files |
| 540 | 576 .PP |
| 541 reuse of independent parts | 577 reuse of independent parts |
| 542 | 578 |
| 543 | 579 |
| 544 | 580 |
| 545 | 581 |