1
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>> [MIZIK jwe]

2
00:00:05,060 --> 00:00:05,890
>> Doug Lloyd: OK.

3
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Se konsa, kite pou nou pale sou jan yo ka
itilize liy la bay lòd Linux.

4
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Koulye a, CS50 IDE a, oswa nan
reyalite, menm yon aparèy CS50,

5
00:00:11,860 --> 00:00:15,210
si w ap abitye ak sa, oswa
w ap pran yon ansyen vèsyon CS50,

6
00:00:15,210 --> 00:00:17,420
se yon machin nwaj ki baze sou
ki te kouri Ubuntu,

7
00:00:17,420 --> 00:00:20,259
ki se youn nan gou yo anpil
nan sistèm nan fonksyone Linux.

8
00:00:20,259 --> 00:00:22,300
Sistèm opere Linux se
te favorize pa pwogramasyon,

9
00:00:22,300 --> 00:00:25,690
paske li nan jis pi fre, dwa?

10
00:00:25,690 --> 00:00:29,170
>> Anpil modèn Linux distribisyon
gen grafik interfaces itilizatè,

11
00:00:29,170 --> 00:00:33,710
ki nou menm tou nou rele GUIs, G-U-I, nan
pèmèt fasil Navigasyon sourit ki baze sou,

12
00:00:33,710 --> 00:00:36,920
kote ou ap pwobableman abitye avèk,
si ou se yon Windows oswa Mac itilizatè,

13
00:00:36,920 --> 00:00:39,961
deplase sourit ou a,
doub-klike sou ikon, ak sou sa.

14
00:00:39,961 --> 00:00:42,210
Toujou menm si, kòm yon pwogramè,
e menm si IDE a

15
00:00:42,210 --> 00:00:44,800
gen kapasite nan
fè kèk itilizatè grafik

16
00:00:44,800 --> 00:00:47,400
bagay, klike, ak
trenen ansanm ak tou sa,

17
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ou pral toujou lè l sèvi avèk ou
fenèt tèminal bèl souvan.

18
00:00:50,197 --> 00:00:52,280
Epi ou ka fè anpil nan la
travay menm ke ou ka

19
00:00:52,280 --> 00:00:53,905
fè ak yon sourit ak kòmandman klavye.

20
00:00:53,905 --> 00:00:56,821
Epi nou ap ale nan pale yon ti kras
sou sa ki kèk nan moun kòmandman

21
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yo kounye a.

22
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>> Koulye a, kòmandman sa yo kapab itilize
sou nenpòt ki opere UNIX ki baze sou

23
00:01:02,490 --> 00:01:06,790
sistèm, ki gen ladan Linux,
men tou, gen ladan Mac OS.

24
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Si ou louvri moute Tèminal sou Mac ou,
ou ka itilize kòmandman egzak sa yo.

25
00:01:12,930 --> 00:01:15,705
Windows tou te gen Kòmandman
Èd Memwa, men kèk nan kòmandman yo

26
00:01:15,705 --> 00:01:17,871
se yon ti kras diferan, se konsa
li pa aktyèlman ap travay,

27
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paske Windows se pa
yon sistèm UNIX ki baze sou.

28
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>> Se konsa, kite a pran yon gade nan kèk
nan sa yo kòmandman Linux.

29
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Yon sèl nan premye ki ou pral
pwobableman itilize byen yon anpil se ls.

30
00:01:26,100 --> 00:01:30,410
Sa se yon l miniskil, ki te swiv pa yon
miniskil a, ki se kout pou lis.

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Ak sa ki lis yo lòd, ki fè se li
ba ou yon sorti nan tout dosye yo

32
00:01:33,720 --> 00:01:35,670
ak dosye nan anyè ou ye kounye a.

33
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Se konsa, ou ka wè tout sa ou kapab
li ale nan soti nan kote ou kounye a ye.

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>> Se konsa, mwen te louvri moute isit la IDE nan CS50.

35
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Apre sa, mwen pral rale-a nan yon
dezyèm l 'ban nou yon gade pi pre,

36
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men isit la nan foto a gwo
nan sa ki IDE a sanble.

37
00:01:47,240 --> 00:01:49,580
Sou bò gòch la, ou ka wè nou gen
yon pye bwa ranpli, kote ou ap pwobableman

38
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abitye avèk, doub-klike, ak
dosye ak dosye ansanm ak tou sa lòt bagay.

39
00:01:52,663 --> 00:01:54,694
Se konsa, sa a, se toujou la
nan aparèy la CS50.

40
00:01:54,694 --> 00:01:57,860
Nan sant la nan tèt la se kote w ap
ale nan dwe ekri kòd ou a, yon fwa

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ou klike sou yon dosye.

42
00:01:58,960 --> 00:02:00,900
Apre sa, nan pati anba a, nou
gen yon fenèt tèminal,

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ki se kote nou ka egzekite
kòmandman tèminal sa yo.

44
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>> Mwen pral rale-nan
ak tèt sou isit la, jis

45
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montre w ki, an reyalite, mwen kapab
klike sou dosye sa yo ak kle flèch.

46
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Se konsa, byen klè, kote mwen kounye a menm ki, mwen gen
de dosye, rele pset0 ak pset1,

47
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ak twa dosye, yon sèl rele
hello, yon sèl rele hello.c,

48
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ak youn rele hello.txt.

49
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>> Se konsa, kite yo deplase desann nan tèminal la
fenèt epi pou yo jwenn yon gade pi prè ou.

50
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Se konsa, nou jis te pale osijè, ankò, sou la
reyalite ki nou gen twa dosye ak de

51
00:02:31,010 --> 00:02:32,970
dosye nan anyè aktyèl la.

52
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Si m 'tape ls, ki ankò
se yo lòd, ki nan lis

53
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sa ki nan aktyèl la
anyè, ak Lè sa a mwen frape Antre,

54
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gade ki sa mwen wè, hello, hello.c,
hello.txt, pset0 ak pset1.

55
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>> pset0 ak pset1 yo
sifas ki gen koulè ble, ki endike

56
00:02:49,620 --> 00:02:52,420
nou sa sa yo se repèrtwar
ke nou te kapab navige nan.

57
00:02:52,420 --> 00:02:54,503
Epitou, n ap aprann yon ti kras
ti jan sou ki jan yo navige

58
00:02:54,503 --> 00:02:56,290
nan repèrtwar nan yon minit.

59
00:02:56,290 --> 00:03:00,920
Epi se tout bagay lòt ki gen koulè pal nwa,
si li nan yon dosye tèks oswa yon kòd sous

60
00:03:00,920 --> 00:03:03,590
ranpli, ak vèt, si
li nan yon dosye ègzèkutabl.

61
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Se konsa, byen klè, sa vle di ke mwen
te kapab kouri nan yon pwogram yo rele, hello.

62
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Sa a ki sa yon sèl nan vèt gen vle di.

63
00:03:07,950 --> 00:03:10,080
Men, fondamantalman, ou tape nan
te ls lòd pèmèt

64
00:03:10,080 --> 00:03:13,470
m 'fè yon gade nan tout bagay ki egziste
nan anyè mwen ye kounye a, ki

65
00:03:13,470 --> 00:03:17,940
alimèt sa nou wè isit la, nan la
grafik ekspozisyon nan menm bagay la.

66
00:03:17,940 --> 00:03:19,940
Lòd nan pwochen ou pral
pwobableman itilize byen yon ti jan

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se CD, miniskil c, miniskil d,
ki se kout pou yon chanjman anyè.

68
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Sa pèmèt nou fè sa m 'te
ap pale de yon dezyèm Anons sa pibliye depi, ki

69
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se navige ant
repèrtwar nan yo lòd, ki

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00:03:31,150 --> 00:03:33,700
liy, kòm opoze a
doub-klike sou dosye.

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00:03:33,700 --> 00:03:37,250
Se konsa, si nou tape cd ak Lè sa a
non an nan yon anyè,

72
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nou ka jwenn nan ki anyè.

73
00:03:40,890 --> 00:03:44,680
>> Kòm yon sou kote, konnen ke non an
nan anyè aktyèl la se toujou

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dot, ak non an nan anyè a
yon nivo pi wo a kote nou ye kounye a,

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ki se non an nan folder nan nan
ki katab nou an, se, dot, dot--

76
00:03:54,820 --> 00:03:56,851
oswa nan ki folder nou an, se, se dot, dot.

77
00:03:56,851 --> 00:03:59,350
Epi si w ap kirye de tout tan tout tan
non an nan anyè ou,

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00:03:59,350 --> 00:04:03,430
ou ka tape PWD, ki vle di
pou prezan anyè ap travay.

79
00:04:03,430 --> 00:04:06,827
Nou pral pran yon gade nan tout moun sa yo
kounye a, pa tit tounen nan IDE nan CS50.

80
00:04:06,827 --> 00:04:08,160
Se konsa, mwen tounen nan vorkspas mwen kounye a.

81
00:04:08,160 --> 00:04:11,930
Apre sa, mwen pral rale-an ankò sou la
tèminal, pou nou ka pran yon gade

82
00:04:11,930 --> 00:04:14,209
nan k ap deplase alantou nan IDE a.

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Se konsa, mwen pral nan lis la
Sa ki nan anyè m '

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ankò, jis yo rbrwaye
nou nan kote nou ye.

85
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Se konsa, si mwen tape ls, ki
se pou lis ankò,

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Mwen wè ke mwen ka ale nan pset0 ak pset1.

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00:04:24,160 --> 00:04:26,420
Moun sa yo se repèrtwar yo
Mwen kapab ale nan soti isit la.

88
00:04:26,420 --> 00:04:30,400
Mwen konnen ke, paske IDE a bay
m 'yon siy pa koloran yo ble.

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00:04:30,400 --> 00:04:33,295
>> Se pou nou di ke mwen vle
jwenn nan anyè pset1 mwen,

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paske mwen ap travay sou pwoblèm mete 1.

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Mwen ka tape cd-- ankò, kout pou
chanje espas anyè, pset1.

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Men, si mwen frape Antre, avi sa ki rive.

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Li pa sanble li te yon anpil te pase.

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Men, si ou gade nan èd memwa a, li kounye a
di m 'ke mwen se nan ~ / vorkspas / pset1.

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Mwen te navige nan pset1 nan
katab ki te nan vorkspas mwen.

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>> Men, si mwen tape ls, mwen wè kèk
diferan bagay isit la, dwa?

97
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Sa a se pa menm bagay la tou
lis a, mwen wè anvan.

98
00:05:03,810 --> 00:05:05,350
Mwen te navige nan pset1.

99
00:05:05,350 --> 00:05:08,560
Se konsa, koulye a, lè mwen tape ls, mwen
ap resevwa yon kontèks la nan ki sa mwen kapab

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wè soti nan folder nan pset1.

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>> Koulye a, mwen pral tape kontwòl
l, ki jis efase ekran an.

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Apre sa, mwen pral nan lis la
Sa ki nan anyè a

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ankò, jis konsa ou ka wè.

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00:05:18,880 --> 00:05:20,730
Mwen jis te vle fè ke yo
klè soti kèk nan bagay la

105
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ke ou te wè desann anba a
ak yo anpeche sa a

106
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soti nan pral twò lwen desann sot nan pòte.

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>> Koulye a, mwen te di byen bonè sa a, si mwen vle
navige nan anyè aktyèl la,

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Mwen ka tape cd espas dot.

109
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Frape Antre nan.

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Li pa fè anyen, dwa?

111
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M 'ap chanje repèrtwar
nan anyè aktyèl la.

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W ap pa toujou ale nan
jwenn yon bezwen pou yon sèl dot,

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men ou pral detanzantan.

114
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>> Se pou nou di ke mwen vle
pou avanse pou pi moute yon sèl nivo.

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Mwen vle jwenn tounen nan
anyè vorkspas mwen.

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Mwen pa ka tape cd vorkspas,
gen nan pa gen dosye sa yo oswa anyè.

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Ak rezon an pou that--
si mwen tape ls yon sèl plis time--

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se ke pa gen okenn anyè rele
vorkspas andedan nan anyè pset1 mwen.

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Mwen pral klè m '
ekran ankò ak kontwòl l.

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Sonje sa m 'te di
pi bonè, menm si, ke nou

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ka navige tounen ak dot, dot.

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Sa a non an nan anyè a paran.

123
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Se konsa, si mwen tape cd, espas, dot,
dot, ak Lè sa frape Antre,

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kounye a gade nan sa ki te pase.

125
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Èd memwa lòd mwen di m 'ke mwen se
tounen nan anyè ~ / vorkspas mwen.

126
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Mwen te deplase moute yon nivo,
gras a dot, dot.

127
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>> Koulye a, kite a di ke mwen lè l sèvi avèk yon
sistèm opere se sa ki Linux ki baze sou,

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men li pa nesesèman
fè m 'konnen kote m' prale.

129
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Sa a yon sèl k ap pase nan di nou ke
Mwen se nan ~ / vorkspas kounye a,

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dwa nan èd memwa a.

131
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Men, mwen ta ka konplètman
pèdi nan yon dezòd nan dosye,

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ak mwen pa gen okenn lide kote m 'prale ak
okenn lide kote mwen vle jwenn tounen nan.

133
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Genyen de bagay ke mwen ka fè.

134
00:06:36,320 --> 00:06:40,920
>> Premye a tout, mwen kapab konnen
konnen ki kote mwen menm, lè ou tape PWD.

135
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Sa a anyè k ap travay prezan m 'yo.

136
00:06:42,720 --> 00:06:45,830
Men, si mwen frape Antre, li
di m 'egzakteman ki kote mwen ye menm.

137
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Koulye a, / Home / ubentu se nan
lontan fason pou li di: tild,

138
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ki se anyè lakay ou.

139
00:06:51,290 --> 00:06:56,540
Men, li di m 'ke mwen se nan
home / ubentu / vorkspas, oswa ~ / vorkspas.

140
00:06:56,540 --> 00:07:00,700
>> Mwen pral navige nan
anyè pset1 mwen ankò,

141
00:07:00,700 --> 00:07:02,229
ak mwen pral nan lis sa ki.

142
00:07:02,229 --> 00:07:04,770
Apre sa, mwen wè ke mwen gen yon lòt
anyè a, rele depans siplemantè.

143
00:07:04,770 --> 00:07:09,020
Se konsa, mwen pral CD nan depans siplemantè, ak
Lè sa a, mwen pral klè ekran m 'yo.

144
00:07:09,020 --> 00:07:11,540
>> Se konsa, kounye a, mwen se trè byen lwen nan, dwa?

145
00:07:11,540 --> 00:07:13,680
E si mwen vle tounen
vorkspas imedyatman?

146
00:07:13,680 --> 00:07:15,138
Genyen yon koup bagay mwen te kapab fè.

147
00:07:15,138 --> 00:07:18,750
Mwen te kapab tape cd, dot, dot, koupe, dot,
dot, pou avanse pou pi moute yon nivo ak Lè sa a

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yon lòt nivo.

149
00:07:19,640 --> 00:07:21,090
Men, sa a kalite anmèdan.

150
00:07:21,090 --> 00:07:24,990
>> Se konsa, si mwen janm vle jwenn tounen nan
jis anyè lakay mwen, tild,

151
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Mwen ka tape cd ak pa gen anyen apre li.

152
00:07:27,690 --> 00:07:29,224
Cd, Antre nan.

153
00:07:29,224 --> 00:07:30,140
Epi, koulye a, mwen se nan tild.

154
00:07:30,140 --> 00:07:34,310
Men, si mwen vle pou li ale nan vorkspas,
Mwen ka jis tape cd vorkspas.

155
00:07:34,310 --> 00:07:36,770
Epi sa a, ki jan ou travay
chanje repèrtwar

156
00:07:36,770 --> 00:07:42,080
nan IDE la CS50 oswa nenpòt Linux
sistèm opere nan liy lan lòd.

157
00:07:42,080 --> 00:07:42,580
Tout dwa.

158
00:07:42,580 --> 00:07:45,610
Yon sèl nan pwochen ki ta ka
vini an sou la men se mkdir,

159
00:07:45,610 --> 00:07:48,709
ki se kout pou fè yon anyè,
si mwen bezwen yo kreye yon nouvo folder.

160
00:07:48,709 --> 00:07:50,750
Si w ap abitye ak
sistèm nan fonksyone entèfas,

161
00:07:50,750 --> 00:07:51,820
ou ta ka dwa-klike sou.

162
00:07:51,820 --> 00:07:54,500
Lè sa a,, lè meni an kontèks
Pops leve, chwazi New Dosye.

163
00:07:54,500 --> 00:07:56,250
Sa a pwobableman ki jan
ou te fè l 'anvan an.

164
00:07:56,250 --> 00:08:00,979
Men, nou ka kreye tou
repèrtwar nan liy lan lòd.

165
00:08:00,979 --> 00:08:02,020
Se konsa, nou ap tounen nan IDE a.

166
00:08:02,020 --> 00:08:08,020
Mwen pral rale-an sou tèminal nan ak
lis sa ki nan anyè m '

167
00:08:08,020 --> 00:08:11,882
ankò, jis ban nou
yon ankadreman nan referans.

168
00:08:11,882 --> 00:08:14,340
Se pou nou di sa, kounye a, mwen te
fini travay sou pwoblèm mete 0

169
00:08:14,340 --> 00:08:15,580
ak pwoblèm mete 1.

170
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Se konsa, mwen vle kreye yon nouvo anyè
nan travay sou pou pwoblèm mete 2.

171
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Kouman pou mwen fè sa?

172
00:08:20,420 --> 00:08:24,132
>> Bon, ankò, mwen te kapab dwa-klike sou nan la
kite bò gen epi chwazi New Dosye

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ak kreye yon anyè pset2.

174
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Sa ta travay tou.

175
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Men, Lè sa Mwen menm mwen te fè l 'nan la
liy lòd trè byen vit,

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pa sezisman mkdir, galeri-mwen
tape nan n, but-- pset2 espas.

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Si m 'frape Antre ak Lè sa a mwen lis la
Sa ki nan anyè m 'ankò,

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00:08:38,659 --> 00:08:40,710
Mwen wè ke, gade, kounye a
Mwen gen yon katab pset2.

179
00:08:40,710 --> 00:08:43,110
Apre sa, mwen ka navige nan
ki lè l sèvi avèk CD ak fè

180
00:08:43,110 --> 00:08:45,614
tout travay la mwen bezwen fè pou pset2.

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Dmeran, mwen pral jis pòp sou
isit la vrèman byen vit bò pyebwa ki dosye-a.

182
00:08:48,530 --> 00:08:53,494
Epi ou ka wè ke, tou, nan
grafik Explorer a File,

183
00:08:53,494 --> 00:08:56,160
nou ka wè ke anyè a pset2
te tou yo te kreye a.

184
00:08:56,160 --> 00:08:58,537
Apre sa, mwen ka navige nan li,
lè l sèvi avèk entèfas a tou.

185
00:08:58,537 --> 00:09:00,870
Tan nan pwochen e ke sa a
pwobableman ale nan vini an sou la men

186
00:09:00,870 --> 00:09:03,650
se CP, ki se kout pou kopi.

187
00:09:03,650 --> 00:09:06,960
Kopi, kontrèman ak tout lòt nan
kòmandman nou te wè anvan,

188
00:09:06,960 --> 00:09:11,800
pran de agiman, yon sous, nan
non nan dosye a ke ou vle a kapab bay kopi,

189
00:09:11,800 --> 00:09:15,810
ak yon destinasyon, kote ou
vle a kapab bay kopi dosye a nan.

190
00:09:15,810 --> 00:09:19,490
Li trè fasil a kapab bay kopi
yon dosye, kidonk kite a fè sa.

191
00:09:19,490 --> 00:09:20,640
>> Se konsa, nou ap tounen nan IDE a.

192
00:09:20,640 --> 00:09:24,540
Mwen pral lis sa ki
nan anyè aktyèl mwen ak ls.

193
00:09:24,540 --> 00:09:28,310
Koulye a, kite a di ke mwen vle
fè yon kopi hello.txt.

194
00:09:28,310 --> 00:09:32,120
Yon lòt fwa ankò, ki soti nan pye bwa a dosye sou la
kite, koòdone nan grafik,

195
00:09:32,120 --> 00:09:35,969
Mwen te kapab dwa-klike sou hello.txt,
fè yon kopi, keratin kopi a.

196
00:09:35,969 --> 00:09:38,260
Men, mwen ka fè l 'trè byen vit
nan liy la bay lòd tou.

197
00:09:38,260 --> 00:09:42,520
>> Se pou nou di mwen vle a kapab bay kopi
hello.txt hi.txt.

198
00:09:42,520 --> 00:09:45,850
Mwen kapab CP, espas, hello.txt.

199
00:09:45,850 --> 00:09:48,850
Sa a dosye sous m 'yo, se konsa Se poutèt sa
Mwen pral chwazi ke yon moun an premye.

200
00:09:48,850 --> 00:09:51,058
Lè sa a, mwen bezwen nan non an
dosye destinasyon, hi.txt.

201
00:09:51,058 --> 00:09:53,690

202
00:09:53,690 --> 00:09:54,620
Mwen frape Antre nan.

203
00:09:54,620 --> 00:09:57,930
Men, si mwen lis sa ki nan mwen an
anyè ankò, gen nan hi.txt.

204
00:09:57,930 --> 00:09:59,220
Mwen te fè yon kopi li.

205
00:09:59,220 --> 00:10:01,090
Ak nan reyalite, si mwen te ale
nan hi.txt, mwen te kapab

206
00:10:01,090 --> 00:10:04,030
wè ke li ta pwal genyen yon egzak
kopi de tout bagay ki

207
00:10:04,030 --> 00:10:08,330
te egziste nan dosye hello.txt mwen.

208
00:10:08,330 --> 00:10:09,790
>> Se konsa, sa a, se ki jan ou kopi yon dosye.

209
00:10:09,790 --> 00:10:12,680
Men, sa ki si ou vle
kopi yon anyè tout antye?

210
00:10:12,680 --> 00:10:16,510
Se konsa, pou yon dezyèm fwa, kite a pran yon gade
nan sa ki nan nan anyè pset0 mwen.

211
00:10:16,510 --> 00:10:23,950
Si m 'pset0 CD ak lis sa ki,
Mwen gen yon anyè rele, echantiyon,

212
00:10:23,950 --> 00:10:26,252
ak yon dosye grafouyen, scratch.sb2.

213
00:10:26,252 --> 00:10:27,210
Se konsa, sa a, se bon yo konnen.

214
00:10:27,210 --> 00:10:29,800
Se konsa nou klè ekran an,
ak mwen pral ale tounen

215
00:10:29,800 --> 00:10:32,870
nan anyè vorkspas mwen an pou yon dezyèm fwa.

216
00:10:32,870 --> 00:10:36,630
>> Se pou nou di sa, kounye a, mwen vle
fè yon kopi nan anyè pset0 mwen.

217
00:10:36,630 --> 00:10:42,940
Mwen pa ka jis di cp pset0
pset3, pou egzanp.

218
00:10:42,940 --> 00:10:46,220
Ou jwenn mesaj etranj sa a,
omissions anyè pset0.

219
00:10:46,220 --> 00:10:47,439
Poukisa ou jwenn ke mesaj?

220
00:10:47,439 --> 00:10:49,730
Oke, li sanble ke, lè
ou gen yon anyè ki

221
00:10:49,730 --> 00:10:53,150
gen lòt bagay andedan nan li,
yo lòd, ki CP pa reyèlman

222
00:10:53,150 --> 00:10:55,590
nesesèman konnen ki sa fè ak li.

223
00:10:55,590 --> 00:10:59,670
>> Nou bezwen klèman
di Linux, tèminal la,

224
00:10:59,670 --> 00:11:03,720
Mwen vle ou a kapab bay kopi nan
anyè pset0 ak kopi

225
00:11:03,720 --> 00:11:07,530
chak folder ki egziste andedan
nan li ak tout dosye ki

226
00:11:07,530 --> 00:11:08,750
egziste andedan nan li.

227
00:11:08,750 --> 00:11:13,270
Nan lòt mo, mwen bezwen ou a
recursive plonje desann nan pset0

228
00:11:13,270 --> 00:11:15,660
, epi fè yon kopi tout bagay nan la.

229
00:11:15,660 --> 00:11:25,280
>> Si m 'vle fè sa, sa mwen kapab fè
se CP-r, pou repetitif, pset0 pset3.

230
00:11:25,280 --> 00:11:26,850
Frape Antre nan.

231
00:11:26,850 --> 00:11:29,290
Koulye a, si mwen lis la
Sa ki nan anyè m 'yo,

232
00:11:29,290 --> 00:11:32,180
Mwen wè gen nan pset3 nan
anyè ke mwen ka travay avèk yo.

233
00:11:32,180 --> 00:11:36,990
Men, si mwen CD nan pset3 kounye a epi yo
Lè sa a, lis sa ki, gade,

234
00:11:36,990 --> 00:11:39,594
gen nan echantiyon ak scratch.sb2 ankò.

235
00:11:39,594 --> 00:11:40,510
Se konsa, sa a, se trè fre.

236
00:11:40,510 --> 00:11:43,819
Se konsa, sa a, se ki jan ou ka kopye yon tout
anyè, epi li pa jis yon dosye sèl.

237
00:11:43,819 --> 00:11:45,860
Se konsa, si ou vle kopi yon
anyè, jis sonje

238
00:11:45,860 --> 00:11:49,830
yo sèvi ak drapo a -r lè w ap
travay ak yo lòd, ki CP.

239
00:11:49,830 --> 00:11:50,330
Tout dwa.

240
00:11:50,330 --> 00:11:52,320
Se konsa, mwen te kopye yon dosye, men
Mwen te fè l 'pa erè.

241
00:11:52,320 --> 00:11:53,695
Epi, koulye a, mwen vle debarase m de li.

242
00:11:53,695 --> 00:11:54,850
Kouman pou mwen fè sa?

243
00:11:54,850 --> 00:11:56,830
Yon fwa ankò, si w ap abitye
ak yon koòdone entèfas,

244
00:11:56,830 --> 00:11:58,310
ou ka dwa-klike sou
ak jis chwazi Efase.

245
00:11:58,310 --> 00:12:00,630
Epi, se pral voye li nan la
fatra oswa Resikle Bin a.

246
00:12:00,630 --> 00:12:03,320
Men, nan liy la bay lòd, nou
ka jis tape RM, pou retire,

247
00:12:03,320 --> 00:12:05,580
ak Lè sa a non an nan la
ranpli nou vle debarase m de.

248
00:12:05,580 --> 00:12:08,614
>> Koulye a, RM se anpil prekosyon.

249
00:12:08,614 --> 00:12:11,280
Li fè sa ki yon anpil nan doub-tcheke,
a asire w ke ou aktyèlman

250
00:12:11,280 --> 00:12:12,377
vle efase dosye a.

251
00:12:12,377 --> 00:12:15,460
Li pa vle fè okenn erè,
paske gen nan pa gen Resikle Bin isit la.

252
00:12:15,460 --> 00:12:17,010
Yon fwa nou efase yon dosye, li nan ale.

253
00:12:17,010 --> 00:12:18,710
Apre sa, gen nan reyèlman pa gen fason yo kapab reprann li.

254
00:12:18,710 --> 00:12:20,730
Se konsa, nou bezwen yo dwe bèl
atansyon, ak pou RM

255
00:12:20,730 --> 00:12:23,110
ki pral yo dwe reyèlman atansyon pou nou.

256
00:12:23,110 --> 00:12:27,120
>> Se konsa, kite yo ale tounen nan IDE a
ak debarase m de ke dosye hi.txt

257
00:12:27,120 --> 00:12:29,640
ke mwen kreye yon minit de sa ak kopi.

258
00:12:29,640 --> 00:12:30,560
Se konsa, nou ap nan IDE a.

259
00:12:30,560 --> 00:12:33,180
Apre sa, mwen lis sa ki nan anyè m '
ankò, jis bay nou kèk kontèks.

260
00:12:33,180 --> 00:12:36,500
Mwen vle di, ou ka wè ke gen nan hi.txt,
ki mwen te kreye yon ti tan de sa.

261
00:12:36,500 --> 00:12:38,196
Koulye a, mwen vle debarase m de li.

262
00:12:38,196 --> 00:12:38,820
Kouman pou mwen fè sa?

263
00:12:38,820 --> 00:12:39,810
>> Yon fwa ankò, jis RM.

264
00:12:39,810 --> 00:12:46,220
Se konsa, mwen ka tape RM hi.txt ak frape Antre nan.

265
00:12:46,220 --> 00:12:47,970
Apre sa, nan ke yo te RM
reyèlman atansyon pou nou

266
00:12:47,970 --> 00:12:50,178
epi asire nou aktyèlman
vle efase sa a ranpli.

267
00:12:50,178 --> 00:12:52,784
Èske ou reyèlman vle retire
regilye dosye hi.txt vid?

268
00:12:52,784 --> 00:12:55,200
Se jis tankou yon operasyon
sistèm, tankou Windows oswa Mac,

269
00:12:55,200 --> 00:12:56,310
ke ou ta ka gen
abitye avèk eklate moute

270
00:12:56,310 --> 00:12:58,770
ki bwat di yo ou reyèlman
w ke ou vle fè sa a.

271
00:12:58,770 --> 00:13:01,228
>> Mwen se trè asire w mwen vle sa a,
se konsa mwen pral tape, yes--

272
00:13:01,228 --> 00:13:04,390
oswa mwen te kapab tou jis
tape y-- ak frape Antre nan.

273
00:13:04,390 --> 00:13:08,620
Men, si mwen lis sa ki nan mwen an
anyè ankò, se hi.txt ale.

274
00:13:08,620 --> 00:13:10,000
Pa move, dwa?

275
00:13:10,000 --> 00:13:12,410
Se pou yo Kontwòl laprès L, jis
yo debarase m de tout bagay sa a

276
00:13:12,410 --> 00:13:14,900
epi pou yo jwenn nou tounen nan
tèt la nan ekran an.

277
00:13:14,900 --> 00:13:18,520
>> Koulye a, gen se yon fason yo
RM kous kout, se konsa

278
00:13:18,520 --> 00:13:20,090
ke li pa mande nou kesyon sa a.

279
00:13:20,090 --> 00:13:22,060
Nou vrèman konnen nou vle
yo debarase m de ki ranpli,

280
00:13:22,060 --> 00:13:23,490
epi nou pa menm vle
yo dwe mande kesyon an.

281
00:13:23,490 --> 00:13:24,720
Ki jan nou fè sa?

282
00:13:24,720 --> 00:13:27,180
Bon, nou ka presize yon
siplemantè drapo, jis tankou nou

283
00:13:27,180 --> 00:13:30,400
te fè ak CP kote nou
ta ka ajoute drapo a -r,

284
00:13:30,400 --> 00:13:32,800
recursive kopi nan yon anyè.

285
00:13:32,800 --> 00:13:35,630
Genyen yon lòt drapo
pou RM, ki se -f,

286
00:13:35,630 --> 00:13:39,470
ki se fòse RM fè egzakteman
sa n ap di li fè.

287
00:13:39,470 --> 00:13:44,610
>> Se konsa nou di sa, kounye a, mwen vle
yo debarase m de dosye hello.txt mwen.

288
00:13:44,610 --> 00:13:46,490
Mwen pa vle ke yon moun swa.

289
00:13:46,490 --> 00:13:47,370
Kisa mwen ka fè?

290
00:13:47,370 --> 00:13:54,710
Oke, mwen ka RM -f hello.txt.

291
00:13:54,710 --> 00:13:57,530
Ki sa ou panse se
pral rive isit la?

292
00:13:57,530 --> 00:13:58,030
Li nan ale.

293
00:13:58,030 --> 00:13:59,363
Pa t 'menm mande m' kesyon an.

294
00:13:59,363 --> 00:14:03,600
Lè an reyalite, si mwen lis sa ki
nan anyè m 'ankò, li nan ale.

295
00:14:03,600 --> 00:14:05,750
Gen nan pa gen defèt isit la.

296
00:14:05,750 --> 00:14:09,554
hello.txt se ale, e mwen pa t '
menm mande si mwen te vle efase li.

297
00:14:09,554 --> 00:14:11,595
E si mwen vle debarase m
nan yon anyè tout antye?

298
00:14:11,595 --> 00:14:14,180

299
00:14:14,180 --> 00:14:17,039
Wout la ou fè sa se
trè menm jan ak kopi.

300
00:14:17,039 --> 00:14:19,080
Si ou vle efase yon
anyè, ou pa fè sa jis

301
00:14:19,080 --> 00:14:22,121
vle efase anyè a, ou vle
yo efase tout bagay andedan nan li.

302
00:14:22,121 --> 00:14:26,250
Se konsa, ou sèvi ak -r, nan
recursive efase yon anyè.

303
00:14:26,250 --> 00:14:28,600
>> Se konsa nou RM -r pset2.

304
00:14:28,600 --> 00:14:31,870
M 'ap pa aktyèlman ap travay sou pset2,
Se konsa, mwen ka debarase m de ki anyè.

305
00:14:31,870 --> 00:14:33,040
Mwen frape Antre nan.

306
00:14:33,040 --> 00:14:35,050
Èske mwen vle retire
anyè, pset2 la?

307
00:14:35,050 --> 00:14:37,160
Wi, mwen fè.

308
00:14:37,160 --> 00:14:41,150
Men, si mwen lis sa ki nan
anyè mwen ankò, li nan ale.

309
00:14:41,150 --> 00:14:41,650
Tout dwa?

310
00:14:41,650 --> 00:14:43,739
>> Youn nan pi plis varyasyon sou tèm sa a.

311
00:14:43,739 --> 00:14:46,280
Se konsa, mwen pral klè ekran an ankò,
yo mete tout bagay nan tèt la.

312
00:14:46,280 --> 00:14:47,420
Frape ls.

313
00:14:47,420 --> 00:14:49,890
Koulye a, mwen vle debarase m
nan anyè pset3 mwen,

314
00:14:49,890 --> 00:14:52,810
ak mwen vrèman konnen mwen vle
debarase m de anyè pset3 mwen.

315
00:14:52,810 --> 00:15:00,120
Mwen kapab recursive ak lafòs
retire anyè pset3 mwen.

316
00:15:00,120 --> 00:15:03,900
>> Koulye a, w ap ale nan dwe reyèlman
atansyon lè w ap itilize RM -rf.

317
00:15:03,900 --> 00:15:06,784
Kòm ou pwogram plis, li pral
yon bagay ou jis fè vrèman byen vit.

318
00:15:06,784 --> 00:15:08,200
Ak nan reyalite, mwen fè l 'tout tan tout tan an.

319
00:15:08,200 --> 00:15:10,380
Men, li kapab mennen nan kèk
konsekans dezastre,

320
00:15:10,380 --> 00:15:12,340
si ou aksidantèlman
efase bagay la mal.

321
00:15:12,340 --> 00:15:15,089
Se konsa, mwen vle ou yo dwe konnen ke
sa a se yon opsyon ki disponib nou la a,

322
00:15:15,089 --> 00:15:17,220
men sèvi ak li ti kras,
epi sèvi ak li avèk prekosyon.

323
00:15:17,220 --> 00:15:20,910
>> Mwen konnen pou yon reyalite mwen pa ap travay
sou pwoblèm mwen mete 3 ankò, se konsa mwen

324
00:15:20,910 --> 00:15:22,550
ale nan debarase m de tout moun ki dosye.

325
00:15:22,550 --> 00:15:26,420
Apre sa, mwen konnen mwen pa vle ap mande
chak fwa yon sèl si mwen vle efase

326
00:15:26,420 --> 00:15:30,640
yon dosye, se konsa mwen pral RM -rf pset3.

327
00:15:30,640 --> 00:15:32,640
Pa t 'menm mande m' si mwen
te vle debarase m de li.

328
00:15:32,640 --> 00:15:33,840
Mwen frape ls.

329
00:15:33,840 --> 00:15:35,680
se pset3 ale.

330
00:15:35,680 --> 00:15:39,730
Se konsa, sa a, se tout varyasyon sa yo ke ou
ka itilize yo debarase m de dosye ak RM.

331
00:15:39,730 --> 00:15:43,620
>> Lòd dènye liy lòd nan sa a, se
ale nan bèl itil pou ou

332
00:15:43,620 --> 00:15:46,391
se MV, ki se kout pou deplase.

333
00:15:46,391 --> 00:15:48,960
Deplase se fondamantalman ekivalan a chanje non.

334
00:15:48,960 --> 00:15:53,870
L ap deplase yon dosye soti nan yon kote nan
yon lòt, sous la nan destinasyon an.

335
00:15:53,870 --> 00:15:59,400
Se pou nou wè ki kote w ap itilize yon fòs mouvman
gen sou la men nan fenèt la tèminal.

336
00:15:59,400 --> 00:16:02,070
>> Se konsa, mwen se nan pset1 mwen
anyè, e mwen te remake

337
00:16:02,070 --> 00:16:03,860
te yon bagay ale yon ti kras mal.

338
00:16:03,860 --> 00:16:08,620
Mwen te ap travay sou pwoblèm visye mwen,
men aksidantèlman mwen rele l 'greddy.

339
00:16:08,620 --> 00:16:11,380
Se konsa, lè mwen eseye epi kouri l 'nan
check50, li pa reyèlman travay.

340
00:16:11,380 --> 00:16:12,630
M 'fè gen yon koup nan opsyon.

341
00:16:12,630 --> 00:16:16,220
Nou te kapab fè sa nou te fè anvan,
ki se fè yon kopi dosye a.

342
00:16:16,220 --> 00:16:23,960
Mwen te kapab kopi greddy.c
greedy.c, dwa?

343
00:16:23,960 --> 00:16:25,580
Frape Antre nan.

344
00:16:25,580 --> 00:16:28,180
Mwen wè ke tou de dosye ki genyen.

345
00:16:28,180 --> 00:16:36,337
Lè sa a, mwen te kapab RM,
yo retire, greddy.c.

346
00:16:36,337 --> 00:16:37,170
Sa vin debarase m de li.

347
00:16:37,170 --> 00:16:40,920
Se konsa, ki ta travay, apre yo fin mwen konfime
ke mwen vle debarase m de li.

348
00:16:40,920 --> 00:16:44,770
Apre sa, mwen gen efektivman
chanje non greddy.c greedy.c.

349
00:16:44,770 --> 00:16:48,460
Mwen kopye li, ak Lè sa a
retire orijinal la.

350
00:16:48,460 --> 00:16:50,170
>> Men, sa a yon pwosesis milti-etap.

351
00:16:50,170 --> 00:16:51,670
Epi sètènman, gen nan yon fason pi bon.

352
00:16:51,670 --> 00:16:52,420
An reyalite, gen.

353
00:16:52,420 --> 00:16:55,810
Se konsa nou frape kontwòl L,
jis yo pote sa a tounen moute,

354
00:16:55,810 --> 00:16:58,680
ak lis sa ki
nan anyè m 'ankò.

355
00:16:58,680 --> 00:17:00,350
>> Se konsa nou di, o, mwen te fè yon erè.

356
00:17:00,350 --> 00:17:03,470
Mwen aktyèlman vrèman t 'vle
yo rele ki greddy.c dosye-a.

357
00:17:03,470 --> 00:17:11,369
Nan yon sèl tonbe plongée, mwen ka tape
deplase greedy.c greddy.c.

358
00:17:11,369 --> 00:17:12,470
Frape Antre nan.

359
00:17:12,470 --> 00:17:15,210
Epi, koulye a, mwen pa t 'gen
a kapab bay kopi epi retire li,

360
00:17:15,210 --> 00:17:16,880
Mwen jis te kapab chanje non li.

361
00:17:16,880 --> 00:17:18,710
One-Stop fè makèt.

362
00:17:18,710 --> 00:17:21,160
>> Koulye a, gen yon anpil nan lòt
debaz liy lòd sèvis piblik

363
00:17:21,160 --> 00:17:22,640
ke ou ka sèvi ak ak
liy la bay lòd Linux.

364
00:17:22,640 --> 00:17:24,990
Epitou, n ap dwe diskite sou yon anpil
nan yo nan tan kap vini an nan CS50.

365
00:17:24,990 --> 00:17:27,948
Men, pou kounye a, jis ap resevwa pye ou
mouye ak travay ak tèminal sa a

366
00:17:27,948 --> 00:17:30,540
anviwònman, senk kòmandman sa yo
ta dwe fè ou jwenn trè lwen

367
00:17:30,540 --> 00:17:34,990
nan navige ozalantou yo ak
travay ak dosye nan IDE ou

368
00:17:34,990 --> 00:17:37,770
oswa nan tou sa Linux ki baze sou
opere sistèm w ap itilize.

369
00:17:37,770 --> 00:17:40,580
>> Si ou se kirye, epi ou vle
gade devan yon ti jan nan kèk

370
00:17:40,580 --> 00:17:43,420
a kòmandman yo liy lòd
nou pral lè l sèvi avèk nan lavni an,

371
00:17:43,420 --> 00:17:46,930
isit la nan yon lis ki gen yon koup
nan yo menm ki pi komen.

372
00:17:46,930 --> 00:17:47,820
Mwen se Doug Lloyd.

373
00:17:47,820 --> 00:17:49,860
Sa a se CS50.

374
00:17:49,860 --> 00:17:52,598