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📁 操作系统设计与实现源码
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3137(list)S3293(of)S3410(colon-separated)S4081(`name=sequence')S4826(pairs.)S5104(The)S5736 V10 I1080(name)S10 R1327(is)S1423(a)S1497(short)S1727(mnemonic)S2180(for)S2327(the)S2479(command,)S2929(the)S10 I3081(sequence)S10 R3479(is)S3575(the)S3727(sequence)S4125(of)S4238(keystrokes)S4697(to)S4805(be)S4930(typed)S5183(to)S5856 V(invoke)273 1080 A1398(the)S1566(command.)S2057(This)S2281(sequence)S2695(may)S2912(contain)S3252(a)S3341(\303X)S3492(escape,)S3830(which)S4120(means)S4421(control-X,)S4882(and)S5071(a)S5160(\\X)S5976 V1080(escape,)S1411(which)S1694(means)S1988(X.)S2123(The)S2317(latter)S2562(can)S2739(be)S2871(used)S3092(to)S3207(get)S3367(the)S3527(characters)S(`\303',)127 3974 A4139(`\\')S4273(and)S4456(`:')S4590(in)S4706(the)S4867(sequence.)S6096 V1080(There)S1344(are)S1496(two)S1675(keymaps)S2060(available,)S2476(the)S2626(default)S2933(one)S3105(and)S3277(a)S3349(user-de\256ned)S3874(one.)S4096(You)S4296(can)S4463(switch)S4753(between)S5116(one)S6216 V1080(and)S1250(the)S1398(other)S1630(with)S1834(the)S10 I(change)290 1982 A(keymap)308 2297 A10 R2630(command.)S6384 V1080(The)S10 I1267(yap)S10 R1442(commands)S1907(are)S2061(described)S2477(below.)S2803(The)S2990(mnemonics)S3483(for)S3631(the)S3784(commands)S4249(are)S4403(given)S4657(in)S4766(parentheses.)S6504 V1080(The)S1272(default)S1587(key)S1767(sequences)S2210(\(if)S2341(any\))S2555(are)S2714(given)S2972(after)S3192(the)S3349(mnemonic.)S3857(Every)S4132(command)S4562(takes)S4803(an)S4932(optional)S6624 V1080(integer)S1406(argument,)S1857(which)S2149(may)S2368(be)S2509(typed)S2779(before)S3084(the)S3254(command.)S3722(Some)S3998(commands)S4480(just)S(ignore)257 4672 A4976(it.)S5104(The)S6744 V1080(integer)S1385(argument)S1790(is)S1882(referred)S2228(to)S2331(as)S10 I2440(i)S10 R2476(.)S2551(Usually,)S2914(if)S10 I3001(i)S10 R3054(is)S3146(not)S3299(given,)S3572(it)S3653(defaults)S3997(to)S4100(1.)S6912 V1080(visit)S1278(previous)S1649(\256le)S1803(\()S10 I1837(bf)S10 R1923(\))S10 B1982(P)S7032 V10 R1440(Visit)S1661(the)S10 I1809(i)S10 R1845(-th)S1982(previous)S2353(\256le)S2507(given)S2755(in)S2858(the)S3006(command)S3427(line.)S7200 V1080(scroll)S1329(one)S1499(line)S1675(up)S1800(or)S1909(go)S2034(to)S2137(line)S2313(\()S10 I2347(bl)S10 R2433(\))S10 B2492(\303K)S10 R2629(or)S10 B2738(k)S7320 V10 R1440(If)S10 I1539(i)S10 R1598(is)S1696(not)S1856(given,)S2136(scroll)S2392(one)S2569(line)S2752(up.)S2909(Otherwise,)S10 I3381(i)S10 R(will)157 3441 A3630(be)S3757(interpreted)S4226(as)S4342(a)S4419(line)S4602(number.)S4966(A)S5071(page)S7440 V1440(starting)S1767(with)S1971(the)S2119(line)S2295(indicated)S(will)157 2689 A2871(then)S3069(be)S3189(displayed.)S7903 V720(Page)S941(1)S2850(\()S2892(local)S3096(\))S4455(September)S4911(13,)S(1996)200 5061 A8143 VEP%%Page: 2 2BP/slant 0 def/height 0 def480 V10 R720(YAP)S930(\()S972(1)S1030(\))S2696(Eighth)S(Edition)296 2989 A4917(YAP)S5127(\()S5169(1)S5227(\))S960 V1080(bottom)S1389(\()S10 I1423(bot)S10 R1559(\))S10 B1618(l)S10 R1671(or)S10 B1780($)S1080 V10 R1440(Go)S1588(to)S1691(the)S1839(last)S2004(line)S2180(of)S2289(the)S(input.)231 2437 A1248 V1080(display)S1395(previous)S1766(page)S1981(\()S10 I2015(bp)S10 R2123(\))S10 B2182(-)S1368 V10 R1440(Display)S1778(the)S1926(previous)S2297(page,)S2537(consisting)S2969(of)S10 I3078(i)S10 R3131(lines,)S3371(\(or)S10 I(page-size)380 3514 A10 R3919(lines)S4134(if)S4221(no)S4346(argument)S4751(is)S4843(given\).)S1536 V1080(display)S1395(previous)S1766(page)S1981(and)S2151(set)S2288(pagesize)S2660(\()S10 I2694(bps)S10 R2841(\))S10 B2900(Z)S1656 V10 R1440(Display)S1779(the)S1928(previous)S2300(page,)S2541(consisting)S2974(of)S10 I3084(i)S10 R3138(lines,)S3379(\(or)S10 I(page-size)380 3523 A10 R3929(lines)S4145(if)S4233(no)S4359(argument)S4765(is)S4859(given\).)S5193(If)S1776 V10 I1440(i)S10 R1493(is)S1585(given,)S1858(the)S10 I(page-size)380 2006 A10 R2411(is)S2503(set)S2640(to)S10 I2743(i)S10 R2779(.)S1944 V1080(scroll)S1329(up)S1454(\()S10 I1488(bs)S10 R1585(\))S10 B1644(\303B)S2064 V10 R1440(Scroll)S1706(up)S10 I1831(i)S10 R1884(lines)S2099(\(or)S10 I2242(scroll-size)S10 R2681(lines)S2896(if)S10 I2983(i)S10 R3036(is)S3128(not)S3281(given.)S(Initially,)344 3554 A3923(the)S10 I4071(scroll-size)S10 R4510(is)S4602(11\).)S2232 V1080(search)S1363(backwards)S1819(for)S1962(pattern)S2267(\()S10 I2301(bse)S10 R2443(\))S10 B2502(?)S2352 V10 R1440(Search)S1744(backwards)S2204(for)S2351(the)S10 I2503(i)S10 R2539(-th)S2680(occurrence)S3152(of)S3265(a)S3339(regular)S3655(expression)S4115(which)S(will)157 4391 A4578(be)S4703(prompted)S5118(for.)S2472 V1440(If)S1564(there)S1822(are)S2002(less)S2209(than)S10 I2438(i)S10 R2522(occurrences)S3060(of)S3200(the)S3379(expression,)S3890(the)S(position)323 4069 A4447(in)S4580(the)S4758(\256le)S4942(remains)S2592 V1440(unchanged.)S1969(Otherwise,)S2453(a)S2542(page)S2776(is)S2887(displayed,)S3341(starting)S3687(two)S3882(lines)S4117(before)S4420(the)S(place)213 4588 A4846(where)S5138(the)S2712 V1440(expression)S1899(was)S(found.)259 2084 A2371(The)S2556(user's)S2825(erase)S3061(and)S(kill)134 3234 A3396(characters)S3834(may)S4035(be)S4158(used)S4370(to)S4476(edit)S4655(the)S4806(expression.)S2832 V1440(Erasing)S1773(back)S1988(past)S2175(the)S2323(\256rst)S2505(character)S2901(cancels)S3223(the)S3371(search)S3654(command.)S2952 V1440(Note:)S1691(Some)S1947(systems)S2292(do)S2419(not)S2575(have)S10 I2793(regex)S10 R3025(\(3\).)S3221(On)S3372(those)S3612(systems,)S3983(searches)S4353(are)S(still)151 4505 A(supported,)421 4684 A5133(but)S3072 V1440(regular)S1751(expressions)S2245(are)S2394(not.)S3240 V1080(skip)S1272(lines)S1487(backwards)S1943(\()S10 I1977(bsl)S10 R2102(\))S10 B2161(S)S3360 V10 R1440(Skip)S10 I1649(i)S10 R1702(lines)S1917(backwards)S2373(and)S2543(display)S2858(a)S2928(page.)S3528 V1080(skip)S1272(pages)S1526(backwards)S1982(\()S10 I2016(bsp)S10 R2163(\))S10 B2222(F)S3648 V10 R1440(Skip)S10 I1649(i)S10 R1702(pages)S1956(backwards)S2412(and)S2582(display)S2897(a)S2967(page.)S3816 V1080(scroll)S1329(up)S1454(and)S1624(set)S1761(scrollsize)S2167(\()S10 I2201(bss)S10 R2337(\))S10 B2396(b)S3936 V10 R1440(Scroll)S1706(up)S10 I1831(i)S10 R1884(lines)S2099(\(or)S10 I2242(scroll-size)S10 R2681(lines)S2896(if)S10 I2983(i)S10 R3036(is)S3128(not)S3281(given.)S3579(If)S10 I3672(i)S10 R3725(is)S3817(given,)S4090(the)S10 I4238(scroll-size)S10 R4677(is)S4769(set)S4906(to)S10 I5009(i)S10 R5045(.)S4104 V1080(change)S1390(key)S1560(map)S1758(\()S10 I1792(chm)S10 R1968(\))S10 B2027(\303[)S4224 V10 R1440(Change)S1772(from)S1993(the)S2141(current)S2452(key)S2622(map)S2820(to)S2923(the)S3071(other)S3303(\(if)S3424(there)S3651(is)S3743(one\).)S4392 V1080(exchange)S1485(current)S1796(page)S2011(and)S2181(mark)S2413(\()S10 I2447(exg)S10 R2595(\))S10 B2654(x)S4512 V10 R1440(Set)S1594(the)S1742(mark)S1974(to)S2077(the)S2225(current)S2536(page,)S2776(and)S2946(display)S3261(the)S3409(previously)S3858(marked)S4185(page.)S4680 V1080(visit)S1278(next)S1476(\256le)S1630(\()S10 I1664(ff)S10 R1728(\))S10 B1787(N)S4800 V10 R1440(Visit)S1661(the)S10 I1809(i)S10 R1845(-th)S1982(next)S2180(\256le)S2334(given)S2582(in)S2685(the)S2833(command)S3254(line.)S4968 V1080(scroll)S1329(one)S1499(line)S1675(down)S1923(or)S2032(go)S2157(to)S2260(line)S2436(\()S10 I2470(\257)S10 R2528(\))S10 B2587(\303J)S10 R2696(or)S10 B2805(\303M)S10 R2959(or)S10 B3068(j)S5088 V10 R1440(If)S10 I1533(i)S10 R1586(is)S1678(not)S1831(given,)S2104(scroll)S2353(one)S2523(line)S2699(down.)S2972(Otherwise,)S10 I3437(i)S10 R(will)157 3490 A3672(be)S3793(interpreted)S4256(as)S4366(a)S4437(line)S4614(number.)S4972(A)S5071(page)S5208 V1440(starting)S1767(with)S1971(the)S2119(line)S2295(indicated)S(will)157 2689 A2871(then)S3069(be)S3189(displayed.)S5376 V1080(display)S1395(next)S1593(page)S1808(\()S10 I1842(fp)S10 R1928(\))S10 B1987(<space>)S5496 V10 R1440(Display)S1778(the)S1926(next)S2124(page,)S2364(consisting)S2796(of)S10 I2905(i)S10 R2958(lines,)S3198(\(or)S10 I(page-size)380 3341 A10 R3746(lines)S3961(if)S4048(no)S4173(argument)S4578(is)S4670(given\).)S5664 V1080(display)S1395(next)S1593(page)S1808(and)S1978(set)S2115(pagesize)S2487(\()S10 I2521(fps)S10 R2646(\))S10 B2705(z)S5784 V10 R1440(Display)S1780(the)S1930(next)S2130(page,)S2372(consisting)S2806(of)S10 I2917(i)S10 R2972(lines,)S3214(\(or)S10 I(page-size)380 3360 A10 R3768(lines)S3986(if)S4076(no)S4204(argument)S4612(is)S4707(given\).)S5042(If)S10 I5138(i)S10 R5194(is)S5904 V1440(given,)S1713(the)S10 I(page-size)380 1861 A10 R2266(is)S2358(set)S2495(to)S10 I2598(i)S10 R2634(.)S6072 V1080(scroll)S1329(down)S1577(\()S10 I1611(fs)S10 R1686(\))S10 B1745(\303D)S

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