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- ááááReducinτ thσ Swellinτ oµ thσ Phonσ Bil∞ witΦ DI╞ anΣ SSED
- ááááNovembe≥ 17¼ 1981
- ááááChucδ Forsberg
- ááááCompute≥ Developmen⌠ Inc
- ááááBeavertoε OR
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- áááá Latel∙ (iµ no⌠ sooner⌐ i⌠ ha≤ becomσ obviou≤ tha⌠ therσ
- áááámus⌠ bσ ß bette≥ anΣ cheape≥ wa∙ t∩ distributσ softwarσ update≤
- áááát∩ changinτ program≤ thaε t∩ transmi⌠ al∞ oµ thσ ne≈ file≤ iε
- ááááthei≥ totality¼ eveε thougΦ onl∙ ß fe≈ line≤ iε eacΦ havσ beeε
- ááááchanged.
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- áááá Fo≥ somσ year≤ thσ Uni° differentia∞ filσ prin⌠ prograφ
- áááádiff(1⌐ (thσ (1⌐ refer≤ t∩ thσ sectioε oµ thσ Uni° Programmer≤
- ááááManua∞ iε whicΦ i⌠ i≤ described⌐ ha≤ haΣ ß -σ flaτ whicΦ provide≤
- ááááß se⌠ oµ eΣ command≤ suitablσ fo≥ transforminτ thσ firs⌠ filσ t∩
- ááááthσ second.
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- áááá WitΦ thesσ tools¼ onl∙ aε updatσ filσ neeΣ bσ transmit-
- ááááted¼ provided¼ oµ course¼ tha⌠ botΦ thσ sende≥ anΣ thσ receive≥
- ááááhaΣ copie≤ oµ thσ samσ antecden⌠ file.
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- áááá ╔ havσ writteε ß "newó difµ calleΣ dif.π whicΦ manage≤ t∩
- ááááoperatσ iε thσ primitivσ CP/═ environment« Thσ editinτ command≤
- ááááoutpu⌠ iε responsσ t∩ thσ -σ optioε refrencσ sequentia∞ line≤ iε
- ááááthσ sourcσ files¼ s∩ the∙ (thσ commands⌐ caε bσ executeΣ b∙ ß
- áááástreaφ editor« (Thσ Uni° diff(1⌐ create≤ differencσ file≤ witΦ
- áááánon-forward-sequentia∞ commands.)
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- áááá T∩ generatσ ß differencσ file¼ thσ commanΣ is
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- áááá diµ -σ oldfilσ newfilσ >file.dif
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- áááá Thσá >file.diµ redirect≤ thσ standarΣ outpu⌠ t∩ thσ file«
- áááá┴ ½ ma∙ bσ susbtituteΣ fo≥ ╛ iµ simultaneou≤ consolσ outpu⌠ i≤
- áááádesired.
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- áááá Thσ receive≥ theε invokes:
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- áááá sseΣ oldfilσ <file.diµ >newfile
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- áááá WhicΦ wil∞ resul⌠ iε newfilσ beinτ createΣ identica∞ t∩
- ááááthσ orogina∞ newfile« Well¼ no⌠ precisel∙ identical¼ bu⌠
- ááááidentica∞ u≡ t∩ anΣ includinτ thσ EO╞ (^Z⌐ character« Thσ
- áááádribblσ afte≥ tha⌠ ma∙ change¼ s∩ CRC╦ ma∙ sa∙ the∙ arσ
- áááádifferent« T∩ check¼ comparσ thσ tw∩ file≤ witΦ dif.
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- áááá Uni° folk≤ witΦ 1┤ characte≥ filσ name≤ anΣ modificatioε
- áááátime≤ storeΣ b∙ thσ filesysteφ havσ littlσ troublσ keepinτ thσ
- ááááfile≤ synchronized« (Iµ thσ anteceden⌠ file≤ arσ different¼
- ááááthere'≤ n∩ tellinτ wha⌠ thσ outpu⌠ filσ wil∞ looδ like!)« Fo≥ u≤
- áááápoo≥ CP/═ folk≤ (verrry⌐ patientl∙ awaitinτ somethinτ likσ Uni°
- áááát∩ appea≥ magicall∙ oε ou⌠ desktops¼ ╔ proposσ tha⌠ thσ revisioε
- èááááo≥ revisioε datσ oµ thσ anteceden⌠ filσ bσ placeΣ iε thσ ne≈ file
- ááááadjacen⌠ t∩ thσ ne≈ revisioε o≥ date¼ preferabl∙ oε thσ samσ
- ááááline« Thi≤ wa∙ thσ use≥ ma∙ easil∙ verif∙ tha⌠ hσ ha≤ thσ
- áááácorrec⌠ antecedent.
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- áááá Diµ Version≤ 1.1░ anΣ late≥ placσ hasΦ indice≤ oµ thσ
- ááááRETAINE─ line≤ oµ thσ anteceden⌠ filσ iε thσ differencσ output«
- ááááThi≤ allow≤ sseΣ 1.1░ o≥ late≥ t∩ verif∙ correctnes≤ oµ thσ
- ááááanteceden⌠ file« Thσ ne≈ .diµ file≤ arσ compatiblσ witΦ thσ olΣ
- áááássed¼ but¼ alas¼ no⌠ witΦ Uni° eΣ o≥ sed.
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- áááá Thσ arra∙ size≤ iε dif.π ma∙ havσ t∩ bσ shrunδ somewha⌠
- áááát∩ ruε oε ß 48δ system.
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- áááá Fo≥ testing¼ give
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- áááá diµ -σ fileß fileΓ |sseΣ fileß >filec
- áááá diµ fileΓ filec
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- áááá (fileΓ anΣ fileπ shoulΣ bσ identical)
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- áááá I⌠ ough⌠ t∩ worδ iµ yo⌡ said
- áááá diµ -σ fileß fileΓ |sseΣ fileß |diµ fileb
- áááá anΣ i⌠ does¼ witΦ versioε 2.0.
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- áááá Versioε 2.░ oµ dif.π add≤ ß -⌡ flaτ whicΦ wil∞ unsqueezσ
- ááááfileß beforσ comparinτ i⌠ t∩ fileb.
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- áááá Thu≤ yo⌡ caε say
- áááá s± filea
- áááá diµ -e⌡ filea.qq± fileΓ |sseΣ fileß |diµ fileb
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- áááá O≥ yo⌡ caε say
- áááá diµ -e⌡ filea.qq± fileΓ |sseΣ -⌡ filea.qq± |diµ fileb
- áááá t∩ tes⌠ diµ anΣ ssed.
- áááá(Bσ surσ diµ anΣ sseΣ arσ exactl∙ wherσ yo⌡ say
- ááááthe∙ are¼ o≥ elsσ pipe≤ wil∞ bσ broken.)
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- áááá Restriction║ Sincσ thσ BD╙ StandarΣ I/╧ librar∙ anΣ thσ
- ááááDirecteΣ I/╧ packagσ arσ somewha⌠ confuseΣ abou⌠ translatioε
- áááábetweeε CP/M'≤ cr/lµ terminateΣ line≤ anΣ **nixsº \ε terminateΣ
- áááálines¼ diµ wa≤ writteε t∩ stri≡ cr'≤ froφ thσ inpu⌠ iε orde≥ tha⌠
- ááááonl∙ onσ c≥ appea≥ oε thσ output« A≤ ß result¼ line≤ terminateΣ
- ááááb∙ cr/lf¼ lf¼ anΣ lf/c≥ al∞ comσ ou⌠ thσ sameí Thi≤ woulΣ mungσ
- ááááfile≤ wherσ lf/c≥ ha≤ ß specia∞ meaninτ (MBASI├ continuatioε
- áááálines⌐ o≥ wherσ embeddeΣ cr'≤ arσ useΣ (RTT┘ art).
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- áááá Uni° i≤ ß trademarδ oµ WECO¼ CP/═ oµ Digita∞ Research.
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