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Backslash

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250: 258: 654:. The failure of Microsoft's security features to recognize unexpected-direction slashes in local and Internet paths, while other parts of the operating system still act upon them, has led to some serious lapses in security. Resources that should not be available have been accessed with paths using particular mixes, such as 649:
family of operating systems inherited the MS-DOS behavior and so still support either character – but individual Windows programs and sub-systems may, wrongly, only accept the backslash as a path delimiter, or may misinterpret a forward slash if it is used as such. Some programs will only accept
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The user manual contains some significant errors. Most of these are due to last minute changes to achieve a greater degree of compatibility with IBM's implementation of MS-DOS (PC DOS). This includes the use of "\" instead of "/" as the path separator, and "/" instead of "-" as the switch
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Outside quoted strings, the only common use of backslash is to ignore ("escape") a newline immediately after it. In this context it may be called a "continued line" as the current line continues into the next one. Some software replaces the backslash+newline with a space.
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character. For transporting of batch files across machines, Microsoft encourages the use of "\" and "/" respectively in the U.S. market. We apologize for any inconveniences these changes may have caused your technical publications staff.
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As of November 2022, efforts to identify either the origin of this character or its purpose before the 1960s have not been successful. The earliest known reference found to date is a 1937 maintenance manual from the
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that might be used in internet standards as "a practical way of identifying character, without reference to a coded character set and its code in coded character set". Consequently, this style may be seen in early
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as the directory separator. Possibly on the insistence of IBM, Microsoft added the backslash to allow paths to be typed at the command line interpreter prompt, while retaining compatibility with MS-DOS 1.0 (in which
1395: 395:, to indicate that the character following it should be treated specially (if it would otherwise be treated literally), or literally (if it would otherwise be treated specially). For instance, inside a C 298: 817:
when these fonts are selected. Computer programs still treat 005C as a backslash in these environments but display it as a yen sign, causing confusion, especially in MS-DOS filenames.
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be made part of the proposed standard, describing the backslash as a "reverse division operator" and cited its prior use by Teletype in telecommunications. In particular, he said, the
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produces an actual double quote rather than the special meaning of the double quote ending the string. An actual backslash is produced by a double backslash
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searches for either '|' or 'b', the first bar is escaped and searched for, the second is not escaped and acts as an "or".
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Computer Standards Collection, Archives Center, National Museum of American History, Smithsonian Institution, box 1.
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was added, which is equivalent to a backslash. Since this can escape the next character, which may itself be a
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Teletype ASR-33 keyboard layout with ASCII character set, prior to June 14, 1966, with backslash on shift+L
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respectively. The Committee adopted these changes into the draft American Standard (subsequently called
1145: 805:. Due to extensive use of the 005C code point to represent the yen sign, even today some fonts such as 1116: 3013: 2987: 2970: 2856: 2431: 1774: 1177: 901: 364: 267: 2491: 293:
published an "Extended character set standard" that includes the symbol at 0x19. In September 1961,
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A Teletype Wheatstone Perforator keyboard from the 1930s, with backslash in the end of the third row
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Especially when describing computer algorithms, it is common to define backslash so that
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Bulletin 125, issue 2: Description and Adjustments of the Teletype Wheatstone Perforator
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paths use backslashes. In some versions, the option character can be changed from
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languages used it the same way, changing subsequent literal characters into
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0x5C that would be used for backslash in ASCII is instead rendered as a
460: 2910: 2799: 1984: 1257: 821: 404: 278:. The symbol was called the "diagonal key", and given a (non-standard) 61: 1733: 614:, all other parts of the operating system accept both characters in a 2120: 1889: 1451:"When did Windows start accepting forward slash as a path separator?" 779: 755: 572: 560:(since it is a reasonable approximation in ASCII of the Greek letter 496:. ALGOL 68 has the choice of 4 Decimal Exponent Symbols: e, E, \, or 825: 809:
render the backslash character as a ¥, so the characters at Unicode
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These operators were used for min and max in early versions of the
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dialects) the backslash is used as an operator symbol to indicate
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versions also replace backslash with other characters, including
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Eaton, John W.; David Bateman; Søren Hauberg (February 2011).
1241: 1150: 667: 542: 376: 290: 684:, the backslash is used to mark format features for editing 545:
version 5.3 and higher, the backslash is used to indicate a
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Visual Basic Language Features: Operators and Expressions
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The backslash is also sometimes used to denote the right
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when used to produce prefix reduction (cumulative fold).
766:, while the (forward) slash is for right matrix divide. 463:, and support for them in C is planned to be removed in 876:
This is the inverse of the code for the slash symbol (
794:(a multi-byte encoding which is 8-bit for ASCII), the 1242:"Revised Report on the Algorithmic Language Algol 68" 1483:. Ziff Davis Enterprise Holdings Inc. Archived from 38:, ":\" redirects here. For the keyboard symbol, see 848: 696: 534:when used to insert fill elements into arrays, and 448: 444: 412: 408: 400: 387:scripting languages, and many file formats such as 324: 316: 305: 302: 91: 86: 59: 52: 47: 1026:"Bulletin 188: Teletype automatic perforator set" 1031:. Teletype Corporation. August 1945. p. 6. 953:. Teletype Corporation. May 1938 . p. ii. 592:was the command-line option indicator. Typing " 1062:. Teletype Corporation. July 1945. p. 9. 270:with a photograph showing the keyboard of its 1790: 1391:MS-DOS v1.25 and v2.0 Source Code, README.txt 985:"The Evolution of Character Codes, 1874–1968" 8: 1322:, ch. 4: anonymous (lambda) functions, p.99 1797: 1783: 1775: 1009:Bemer, R.W.; Buchholz, W. (June 1, 1960). 1681:. Free Software Foundation. p. 145. 978: 976: 974: 650:forward slashes if the path is placed in 575:2.0, released 1983, copied the idea of a 492:programming language uses the "\" as its 440:that lacked the backslash character, the 407:byte instead of an 'n', and the sequence 2943:Version of this table as a sortable list 1532:"USFM – Unified Standard Format Markers" 711:A backslash-like symbol is used for the 893: 869: 699:represents the control character 0x1C, 638:, which allows COMMAND.COM to preserve 1708:"When is a backslash not a backslash?" 1388:Larson, Chris; Immerwahr, Don (1983), 1222:from the original on 17 September 2012 1212:"Arithmetic Operators in Visual Basic" 656:http://example.net/secure\private.aspx 44: 1626:from the original on 26 February 2021 1432:from the original on 21 December 2008 1398:from the original on 21 November 2022 997:from the original on 30 November 2022 813:00A5 (¥) and 005C (\) both render as 770:Confusion with ¥ and other characters 7: 2795: ⟨ ⟩  1688:from the original on 24 October 2012 1457:from the original on 6 February 2009 1333:"Why is the DOS path character "\"?" 451:, the primary modern use may be for 1542:from the original on 13 August 2020 1318:O'Sullivan, Stewart, and Goerzen, 1477:"Microsoft Probes Flaw in ASP.NET" 1011:An Extended Character Set Standard 14: 1562:"C0 control characters set, 1987" 1481:DevSource, sponsored by Microsoft 1192:from the original on June 5, 2018 596:" gave the "wide" option to the " 343:) at its November 1961 meeting. 272:Kleinschmidt keyboard perforator 1740:from the original on 2016-06-13 1714:from the original on 2016-03-23 1656:from the original on 2020-02-21 1601:from the original on 2014-03-26 1572:from the original on 2019-09-06 1513:from the original on 2021-02-02 1357:Necasek, Michal (24 May 2019). 1339:from the original on 2022-11-19 1301:from the original on 2012-10-16 1272:from the original on 2020-07-26 1159:from the original on 2021-08-03 1127:from the original on 2013-12-03 1098:from the original on 2011-08-15 1069:from the original on 2021-12-19 1038:from the original on 2021-12-19 960:from the original on 2021-02-12 927:from the original on 2019-01-18 858:Internet Engineering Task Force 762:the backslash is used for left 1507:"Security Holes That Run Deep" 1335:. Blogs.msdn.com. 2005-06-24. 1252:(1–3): 1–236. September 1973. 983:Fischer, Eric (20 June 2000). 391:, the backslash is used as an 350:supplied with Unix V6 and V7. 1: 1764:"How ASCII got its backslash" 1732:Simonsen, Keld (1991-12-26). 990:. pp. 14–15 (Table 35). 666:The backslash is used in the 425:and vice versa. For instance 1426:.NET Framework Class Library 1178:"3.1.1 Splitting long lines" 847:In 1991, RFC 1345 suggested 677:files to begin markup tags. 583:and thus used the (forward) 1076:– via navy-radio.com. 1045:– via navy-radio.com. 967:– via navy-radio.com. 485:. This rounds toward zero. 455:. Support for trigraphs in 3037: 2258:inverted ! and ? 851:as a unique two-character 606:inside a directory called 331:) could be composed using 164:is a mark used mainly in 33: 18: 2938: 2826: 2730: 2674:sound recording copyright 2628: 2533: 2416: 2284: 2197: 2132: 1958: 1818: 1422:"Path.GetFullPath Method" 148:FULLWIDTH REVERSE SOLIDUS 1620:"Definition:Coset Space" 577:hierarchical file system 299:X3.2 standards committee 105:REVERSE SOLIDUS OPERATOR 19:Not to be confused with 1475:Kaplan, Simone (2004). 782:(a 7-bit code based on 494:Decimal Exponent Symbol 314:ALGOL Boolean operators 312:was needed so that the 2791: { }  2783: ( )  2768: « »  2764: ‹ ›  2749: " "  2745: ' '  2741: “ ”  2737: ‘ ’  1505:Burnett, Mark (2004). 1218:. MSDN. 10 July 2012. 348:C programming language 297:(IBM) proposed to the 262: 254: 16:Typographical mark (\) 3019:Typographical symbols 1650:mathworld.wolfram.com 1291:"Namespaces overview" 836:(Danish, Norwegian), 790:(an 8-bit code), and 642:in the command name. 365:programming languages 359:Programming languages 260: 252: 133:SMALL REVERSE SOLIDUS 2988:Japanese punctuation 2689:registered trademark 2574: |  2432:plus and minus signs 1825:    1146:"The C Preprocessor" 902:Macquarie Dictionary 268:Teletype Corporation 2978:Chinese punctuation 2704:service mark symbol 2447:multiplication sign 1965: &  1117:"C compiler source" 1088:"C compiler source" 832:(German, Swedish), 329:logical disjunction 321:logical conjunction 119:BIG REVERSE SOLIDUS 2993:Korean punctuation 2983:Hebrew punctuation 1736:. Tools.ietf.org. 1710:. Blogs.msdn.com. 1646:"Integer Division" 1320:Real World Haskell 1258:10.1007/BF00265077 686:Bible translations 419:Regular expression 263: 255: 3001: 3000: 2330:ordinal indicator 2273:irony punctuation 1538:. 18 April 2017. 1509:. SecurityFocus. 915:Raymond, Eric S. 735:is equivalent to 647:Microsoft Windows 276:Wheatstone system 153: 152: 40:List of emoticons 36:technical reasons 3026: 2950:Currency symbols 2930: 2929: 2923: 2915: 2914: 2913:(paragraph mark) 2907: 2903: 2895: 2894: 2888: 2884: 2876: 2875: 2869: 2861: 2860: 2853: 2845: 2844: 2838: 2834: 2818: 2817: 2811: 2803: 2802: 2796: 2792: 2788: 2784: 2776: 2775: 2769: 2765: 2757: 2756: 2750: 2746: 2742: 2738: 2722: 2721: 2719:trademark symbol 2715: 2707: 2706: 2700: 2692: 2691: 2685: 2677: 2676: 2670: 2662: 2661: 2655: 2653: 2643: 2642: 2640:copyright symbol 2636: 2620: 2619: 2613: 2605: 2604: 2598: 2590: 2589: 2583: 2579: 2575: 2567: 2566: 2560: 2558: 2548: 2547: 2541: 2525: 2524: 2518: 2510: 2509: 2503: 2495: 2494: 2488: 2480: 2479: 2473: 2465: 2464: 2458: 2450: 2449: 2443: 2435: 2434: 2428: 2424: 2408: 2407: 2401: 2393: 2392: 2386: 2378: 2377: 2371: 2363: 2362: 2356: 2348: 2347: 2341: 2333: 2332: 2326: 2322: 2314: 2313: 2307: 2299: 2298: 2292: 2276: 2275: 2269: 2261: 2260: 2254: 2250: 2242: 2241: 2235: 2227: 2226: 2224:exclamation mark 2220: 2212: 2211: 2205: 2189: 2188: 2182: 2178: 2170: 2169: 2163: 2159: 2155: 2147: 2146: 2140: 2124: 2123: 2117: 2115: 2112: 2109: 2105: 2102: 2098: 2095: 2091: 2088: 2078: 2077: 2071: 2063: 2062: 2056: 2048: 2047: 2041: 2033: 2032: 2026: 2018: 2017: 2011: 2003: 2002: 1996: 1988: 1987: 1981: 1973: 1972: 1966: 1950: 1949: 1943: 1935: 1934: 1928: 1924: 1920: 1912: 1911: 1905: 1901: 1893: 1892: 1886: 1878: 1877: 1871: 1863: 1862: 1856: 1848: 1847: 1841: 1833: 1832: 1826: 1799: 1792: 1785: 1776: 1771: 1766:. Archived from 1749: 1748: 1746: 1745: 1729: 1723: 1722: 1720: 1719: 1704: 1698: 1697: 1695: 1693: 1687: 1680: 1671: 1665: 1664: 1662: 1661: 1642: 1636: 1635: 1633: 1631: 1616: 1610: 1609: 1607: 1606: 1595:ISO 80000-2:2009 1587: 1581: 1580: 1578: 1577: 1558: 1552: 1551: 1549: 1547: 1528: 1522: 1521: 1519: 1518: 1502: 1496: 1495: 1493: 1492: 1472: 1466: 1465: 1463: 1462: 1447: 1441: 1440: 1438: 1437: 1418: 1412: 1411: 1405: 1403: 1385: 1379: 1378: 1376: 1374: 1365:. Archived from 1354: 1348: 1347: 1345: 1344: 1329: 1323: 1316: 1310: 1309: 1307: 1306: 1287: 1281: 1280: 1278: 1277: 1246:Acta Informatica 1238: 1232: 1231: 1229: 1227: 1208: 1202: 1201: 1199: 1197: 1185: 1174: 1168: 1167: 1165: 1164: 1142: 1136: 1135: 1133: 1132: 1113: 1107: 1106: 1104: 1103: 1084: 1078: 1077: 1075: 1074: 1068: 1061: 1053: 1047: 1046: 1044: 1043: 1037: 1030: 1022: 1016: 1014: 1006: 1004: 1002: 996: 989: 980: 969: 968: 966: 965: 959: 952: 942: 936: 935: 933: 932: 912: 906: 898: 881: 879: 874: 850: 816: 804: 750: 749: 739: 734: 698: 657: 641: 633: 629: 609: 605: 601: 595: 591: 563: 558:lambda functions 529: 519: 511: 507: 503: 474:(and some other 453:code obfuscation 450: 446: 428: 414: 410: 402: 393:escape character 338: 334: 326: 318: 311: 307: 303: 285: 274:WPE-3 using the 239:reversed virgule 182: 163: 149: 146: 143: 141: 134: 130: 127: 125: 120: 117: 114: 112: 106: 103: 100: 98: 81: 77: 74: 71: 69: 45: 3036: 3035: 3029: 3028: 3027: 3025: 3024: 3023: 3004: 3003: 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2370: ‱  2369: 2367: 2358: 2355: ‰  2354: 2352: 2343: 2340: %  2339: 2337: 2328: 2325: ª  2324: 2321: º  2320: 2318: 2309: 2306: №  2305: 2303: 2294: 2291: #  2290: 2288: 2280: 2271: 2268: ⸮  2267: 2265: 2256: 2253: ¿  2252: 2249: ¡  2248: 2246: 2237: 2234: ‽  2233: 2231: 2222: 2219: !  2218: 2216: 2207: 2204: ?  2203: 2201: 2193: 2184: 2181: ⸗  2180: 2177: ⹀  2176: 2174: 2165: 2162: —  2161: 2158: –  2157: 2154: ‒  2153: 2151: 2142: 2139: -  2138: 2136: 2128: 2119: 2113: 2110: 2107: 2103: 2100: 2096: 2093: 2089: 2086: 2084: 2082: 2073: 2070: ⁂  2069: 2067: 2058: 2055: *  2054: 2052: 2043: 2040: …  2039: 2037: 2028: 2025: \  2024: 2022: 2013: 2010: /  2009: 2007: 1998: 1995: ^  1994: 1992: 1983: 1980: @  1979: 1977: 1968: 1964: 1962: 1954: 1945: 1942: .  1941: 1939: 1930: 1927: ‴  1926: 1923: ″  1922: 1919: ′  1918: 1916: 1907: 1904: '  1903: 1900: ’  1899: 1897: 1888: 1885: ‐  1884: 1882: 1873: 1870: ;  1869: 1867: 1858: 1855: :  1854: 1852: 1843: 1840: ,  1839: 1837: 1828: 1824: 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747: 737: 736: 726: 709: 664: 655: 639: 631: 627: 607: 603: 597: 593: 589: 570: 561: 527: 517: 513: 509: 505: 501: 499: 459:was removed in 426: 361: 356: 336: 332: 309: 283: 247: 235:reverse solidus 180: 159: 147: 144: 139: 138: 136: 132: 128: 123: 122: 121: 118: 115: 110: 109: 107: 104: 101: 96: 95: 79: 76:REVERSE SOLIDUS 75: 72: 67: 66: 55: 43: 32: 17: 12: 11: 5: 3034: 3033: 3030: 3022: 3021: 3016: 3006: 3005: 2999: 2998: 2996: 2995: 2990: 2985: 2980: 2974: 2973: 2968: 2963: 2958: 2952: 2946: 2945: 2939: 2936: 2935: 2933: 2932: 2917: 2897: 2878: 2863: 2847: 2827: 2824: 2823: 2821: 2820: 2805: 2787:   2778: 2759: 2754:quotation mark 2731: 2728: 2727: 2725: 2724: 2714:   2709: 2699:   2694: 2679: 2664: 2645: 2629: 2626: 2625: 2623: 2622: 2607: 2592: 2569: 2550: 2534: 2531: 2530: 2528: 2527: 2512: 2497: 2482: 2467: 2452: 2437: 2417: 2414: 2413: 2411: 2410: 2395: 2380: 2365: 2350: 2335: 2316: 2301: 2285: 2282: 2281: 2279: 2278: 2263: 2244: 2229: 2214: 2198: 2195: 2194: 2192: 2191: 2172: 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Examples: 495: 491: 486: 484: 481: 477: 473: 468: 466: 462: 458: 454: 443: 439: 434: 430: 424: 420: 416: 406: 399:the sequence 398: 394: 390: 386: 382: 378: 374: 370: 366: 358: 353: 351: 349: 344: 342: 330: 322: 315: 300: 296: 292: 287: 281: 277: 273: 269: 259: 251: 244: 242: 240: 236: 232: 231:reverse slant 228: 224: 220: 216: 212: 208: 207:reverse slash 204: 200: 196: 195: 190: 186: 179: 175: 171: 167: 162: 158: 137: 135: 94: 90: 85: 65: 63: 58: 51: 46: 41: 37: 30: 26: 22: 2966:Math symbols 2927:section mark 2587:vertical bar 2345:percent sign 2144:hyphen-minus 2029: 1768:the original 1742:. Retrieved 1727: 1716:. Retrieved 1702: 1690:. Retrieved 1669: 1658:. Retrieved 1649: 1640: 1628:. Retrieved 1614: 1603:. Retrieved 1594: 1585: 1574:. Retrieved 1565: 1556: 1544:. Retrieved 1536:paratext.org 1535: 1526: 1515:. Retrieved 1500: 1489:. Retrieved 1485:the original 1480: 1470: 1459:. Retrieved 1445: 1434:. Retrieved 1425: 1416: 1407: 1400:, retrieved 1390: 1383: 1371:. 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2773:guillemet 2360:per mille 2030:backslash 1970:ampersand 1947:full stop 1875:semicolon 1692:7 October 1226:7 October 807:MS Mincho 792:Shift JIS 568:Filenames 547:namespace 514:6.0221415 438:computers 295:Bob Bemer 223:backwhack 219:backslant 215:downwhack 166:computing 157:backslash 54:Backslash 2873:manicule 2659:copyleft 2075:asterism 2060:asterisk 2045:ellipsis 1738:Archived 1712:Archived 1683:Archived 1654:Archived 1624:Archived 1599:Archived 1570:Archived 1540:Archived 1511:Archived 1455:Archived 1430:Archived 1396:archived 1337:Archived 1299:Archived 1270:Archived 1220:Archived 1196:July 28, 1190:Archived 1157:Archived 1125:Archived 1123:. 1979. 1096:Archived 1094:. 1975. 1064:Archived 1033:Archived 992:Archived 955:Archived 925:Archived 853:mnemonic 800:yen sign 776:Japanese 636:SWITCHAR 490:ALGOL 68 483:division 367:such as 363:In many 145:\ 129:﹨ 116:⧹ 102:⧵ 92:See also 60:In  21:Backlash 2911:pilcrow 2892:lozenge 2857:fleuron 2800:bracket 2654:  2650:  2559:  2555:  2116:  2085:  1985:at sign 1813:symbols 1805:Common 1546:30 June 1295:php.net 1266:2490556 1121:mit.edu 917:"ASCII" 822:ISO 646 774:In the 722:space. 554:Haskell 480:integer 409:\" 405:newline 245:History 87:Related 62:Unicode 2931:  2920:  2916:  2904:  2900:  2896:  2885:  2881:  2877:  2866:  2862:  2850:  2846:  2842:dagger 2835:  2831:  2819:  2808:  2804:  2793:  2789:  2785:  2781:  2777:  2766:  2762:  2758:  2747:  2743:  2739:  2735:  2723:  2712:  2708:  2697:  2693:  2682:  2678:  2667:  2663:  2648:  2644:  2633:  2621:  2610:  2606:  2602:bullet 2595:  2591:  2580:  2576:  2572:  2568:  2553:  2549:  2538:  2526:  2515:  2511:  2500:  2496:  2485:  2481:  2470:  2466:  2455:  2451:  2440:  2436:  2425:  2421:  2409:  2398:  2394:  2383:  2379:  2368:  2364:  2353:  2349:  2338:  2334:  2323:  2319:  2315:  2304:  2300:  2289:  2277:  2266:  2262:  2251:  2247:  2243:  2232:  2228:  2217:  2213:  2202:  2190:  2179:  2175:  2171:  2160:  2156:  2152:  2148:  2137:  2125:  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1182:GNU 1153:.org 1003:2022 758:and 682:USFM 645:The 634:via 620:APIs 616:path 581:Unix 536:Scan 488:The 389:JSON 385:Unix 373:Perl 335:and 304:and 227:bash 203:UNIX 185:hack 168:and 155:The 34:For 2564:tie 1254:doi 1151:GNU 786:), 754:In 691:In 680:In 675:RTF 668:TeX 630:to 608:DIR 599:DIR 552:In 543:PHP 541:In 525:APL 523:In 512:or 470:In 465:C23 457:C++ 445:??/ 377:PHP 291:IBM 282:of 205:), 3010:: 1652:. 1648:. 1593:. 1568:. 1564:. 1534:. 1479:. 1424:. 1406:, 1361:. 1297:. 1293:. 1268:. 1260:. 1248:. 1244:. 1214:. 1188:. 1180:. 1155:. 1148:. 1119:. 1090:. 973:^ 923:. 919:. 880:). 849:// 715:. 697:^\ 695:, 688:. 658:. 564:. 549:. 520:. 518:23 516:10 508:, 504:, 498:10 467:. 415:. 413:\\ 401:\n 383:, 379:, 375:, 371:, 337:\/ 333:/\ 286:. 241:. 233:, 229:, 225:, 221:, 217:, 213:, 209:, 191:, 187:, 23:, 2652:© 2557:⁀ 2106:* 2099:* 2092:* 1798:e 1791:t 1784:v 1747:. 1721:. 1696:. 1663:. 1634:. 1608:. 1579:. 1550:. 1520:. 1494:. 1464:. 1439:. 1377:. 1346:. 1308:. 1279:. 1256:: 1250:5 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Index

Backlash

¥
technical reasons
List of emoticons
Unicode
SMALL REVERSE SOLIDUS
computing
mathematics
mirror image
slash
escape
C
UNIX


Teletype Corporation
Kleinschmidt keyboard perforator
Wheatstone system
Morse code
IBM
Bob Bemer
X3.2 standards committee
ALGOL Boolean operators
logical conjunction
logical disjunction
ASCII
C programming language
programming languages
C

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