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1.1 ! root 1: .ds a \fR*\ \fP ! 2: .TH SAM 9.1 ! 3: .CT 1 editor ! 4: .SH NAME ! 5: sam \- screen editor with structural regular expressions ! 6: .SH SYNOPSIS ! 7: .B sam ! 8: [ ! 9: .I option ... ! 10: ] [ ! 11: .I files ! 12: ] ! 13: .PP ! 14: .I sam ! 15: .B -r ! 16: .I machine ! 17: .PP ! 18: .B sam.save ! 19: .SH DESCRIPTION ! 20: .I Sam ! 21: is a multi-file editor. ! 22: It modifies a local copy of a Unix file. ! 23: The copy is here called a ! 24: .IR file ; ! 25: a Unix file is distinguished by the trademarked ! 26: adjective. ! 27: The files are listed in a menu available through mouse button 3 ! 28: or the ! 29: .B n ! 30: command. ! 31: Each file has an associated name, usually the name of the ! 32: Unix file from which it was read, and a `modified' bit that indicates whether ! 33: the editor's file agrees with the Unix file. ! 34: The Unix file is not read into ! 35: the editor's file until it first becomes the current file\(emthat to ! 36: which editing commands apply\(emwhereupon its menu entry is printed. ! 37: The options are ! 38: .TP ! 39: .B -d ! 40: Do not download the terminal part of ! 41: .I sam. ! 42: Editing will be done with the command language only, as in ! 43: .IR ed (1). ! 44: .TP ! 45: .BI -r " machine ! 46: Run the host part remotely ! 47: on the specified machine, the terminal part locally. ! 48: This extends graphic editing to files on machines that ! 49: don't ordinarily support it or across ! 50: .RI non- nfs (8) ! 51: connections. ! 52: .SS Regular expressions ! 53: Regular expressions are as in ! 54: .IR egrep ! 55: (see ! 56: .IR gre (1)), ! 57: with the addition of ! 58: .B @ ! 59: and ! 60: .BR \en . ! 61: A regular expression may never contain a literal newline character. ! 62: The elements of regular expressions are: ! 63: .TP ! 64: .B . ! 65: Match any character except newline. ! 66: .TP ! 67: .B \en ! 68: Match newline. ! 69: .TP ! 70: .B \ex ! 71: For any character except ! 72: .B n ! 73: match the character (here ! 74: .BR x ). ! 75: .TP ! 76: .B @ ! 77: Match any character. ! 78: .TP ! 79: .B [abc] ! 80: Match any character in the square brackets. ! 81: .B \en ! 82: may be mentioned. ! 83: .TP ! 84: .B [^abc] ! 85: Match any character not in the square brackets, but never a newline. ! 86: Both these forms accept a range of ! 87: .SM ASCII ! 88: characters indicated by ! 89: a dash, as in ! 90: .BR a-z . ! 91: .TP ! 92: .B ^ ! 93: Match the null string immediately after a newline. ! 94: .TP ! 95: .B $ ! 96: Match the null string immediately before a newline. ! 97: .PP ! 98: Any other character except newline matches itself. ! 99: .PP ! 100: In the following, ! 101: .I r1 ! 102: and ! 103: .I r2 ! 104: are regular expressions. ! 105: .TP ! 106: .BI ( r1 ) ! 107: Match what ! 108: .I r1 ! 109: matches. ! 110: .TP ! 111: .IB r1 | r2 ! 112: Match what ! 113: .I r1 ! 114: or what ! 115: .IR r2 ! 116: matches. ! 117: .TP ! 118: .IB r1 * ! 119: Match zero or more adjacent matches ! 120: of ! 121: .IR r1 . ! 122: .TP ! 123: .IB r1 + ! 124: Match one or more adjacent matches of ! 125: .IR r1 . ! 126: .TP ! 127: .IB r1 ? ! 128: Match zero or one matches of ! 129: .IR r1 . ! 130: .PP ! 131: The operators ! 132: .BR * , ! 133: .B + ! 134: and ! 135: .B ? ! 136: are highest precedence, then catenation, then ! 137: .B | ! 138: is lowest. ! 139: The empty ! 140: regular expression stands for the last complete expression encountered. ! 141: A regular expression in ! 142: .I sam ! 143: matches the longest leftmost substring formally ! 144: matched by the expression. ! 145: Searching in the reverse direction is equivalent ! 146: to searching backwards with the catenation operations reversed in ! 147: the expression. ! 148: .SS Addresses ! 149: An address identifies a substring in a file. ! 150: In the following, `character ! 151: .IR n ' ! 152: means the null string ! 153: after the ! 154: .IR n -th ! 155: character in the file, with 1 the ! 156: first character in the file. ! 157: `Line ! 158: .IR n ' ! 159: means the ! 160: .IR n -th ! 161: match, ! 162: starting at the beginning of the file, of the regular expression ! 163: .L .*\en? . ! 164: (The peculiar properties of a last line without a newline are ! 165: temporarily undefined.) ! 166: All files always have a current substring, called dot, ! 167: that is the default address. ! 168: .SS Simple Addresses ! 169: .TP ! 170: .BI # n ! 171: The empty string after character ! 172: .IR n ; ! 173: .B #0 ! 174: is the beginning of the file. ! 175: .TP ! 176: .I n ! 177: Line ! 178: .IR n . ! 179: .TP ! 180: .BI / regexp / ! 181: .PD0 ! 182: .TP ! 183: .BI ? regexp ? ! 184: The substring that matches the regular expression, ! 185: found by looking toward the end ! 186: .RB ( / ) ! 187: or beginning ! 188: .RB ( ? ) ! 189: of the file, ! 190: and if necessary continuing the search from the other end to the ! 191: starting point of the search. ! 192: The matched substring may straddle ! 193: the starting point. ! 194: .PD ! 195: .TP ! 196: .B 0 ! 197: The string before the first full line. ! 198: This is not necessarily ! 199: the null string; see ! 200: .B + ! 201: and ! 202: .B - ! 203: below. ! 204: .TP ! 205: .B $ ! 206: The null string at the end of the file. ! 207: .TP ! 208: .B . ! 209: Dot. ! 210: .TP ! 211: .B \&' ! 212: The mark in the file (see the ! 213: .B k ! 214: command below). ! 215: .TP ! 216: \f(CW"\f2regexp\f(CW"\f1\f1 ! 217: Preceding a simple address (default ! 218: .BR . ), ! 219: refers to the address evaluated in the unique file whose menu line ! 220: matches the regular expression. ! 221: .SS Compound Addresses ! 222: In the following, ! 223: .I a1 ! 224: and ! 225: .I a2 ! 226: are addresses. ! 227: .TP ! 228: .IB a1 + a2 ! 229: The address ! 230: .I a2 ! 231: evaluated starting at the end of ! 232: .IR a1 . ! 233: .TP ! 234: .IB a1 - a2 ! 235: The address ! 236: .I a2 ! 237: evaluated looking in the reverse direction ! 238: starting at the beginning of ! 239: .IR a1 . ! 240: .TP ! 241: .IB a1 , a2 ! 242: The substring from the beginning of ! 243: .I a1 ! 244: to the end of ! 245: .IR a2 . ! 246: If ! 247: .I a1 ! 248: is missing, ! 249: .B 0 ! 250: is substituted ! 251: If ! 252: .I a2 ! 253: is missing, ! 254: .B $ ! 255: is substituted. ! 256: .TP ! 257: .IB a1 ; a2 ! 258: Like ! 259: .IB a1 , a2, ! 260: but with ! 261: .I a2 ! 262: evaluated at the end of, and dot set to, ! 263: .IR a1 . ! 264: .PP ! 265: The operators ! 266: .B + ! 267: and ! 268: .B - ! 269: are high precedence, while ! 270: .B , ! 271: and ! 272: .B ; ! 273: are low precedence. ! 274: .PP ! 275: In both ! 276: .B + ! 277: and ! 278: .B - ! 279: forms, if ! 280: .I a2 ! 281: is a line or character address with a missing ! 282: number, the number defaults to 1. ! 283: If ! 284: .I a1 ! 285: is missing, ! 286: .L . ! 287: is substituted. ! 288: If both ! 289: .I a1 ! 290: and ! 291: .I a2 ! 292: are present and distinguishable, ! 293: .B + ! 294: may be elided. ! 295: .I a2 ! 296: may be a regular ! 297: expression; if it is delimited by ! 298: .LR ? 's, ! 299: the effect of the ! 300: .B + ! 301: or ! 302: .B - ! 303: is reversed. ! 304: .PP ! 305: It is an error for a compound address to represent a malformed substring. ! 306: Some useful idioms: ! 307: .IB a1 +- ! 308: .RI ( a1 \&\f5-+\fP ) ! 309: selects the line containing ! 310: the end (beginning) of a1. ! 311: .BI 0/ regexp / ! 312: locates the first match of the expression in the file. ! 313: (The form ! 314: .B 0;// ! 315: sets dot unnecessarily.) ! 316: .BI ./ regexp /// ! 317: finds the second following occurrence of the expression, ! 318: and ! 319: .BI .,/ regexp / ! 320: extends dot. ! 321: .SS Commands ! 322: In the following, text demarcated by slashes represents text delimited ! 323: by any printable ! 324: .SM ASCII ! 325: character except alphanumerics. ! 326: Any number of ! 327: trailing delimiters may be elided, with multiple elisions then representing ! 328: null strings, but the first delimiter must always ! 329: be present. ! 330: In any delimited text, ! 331: newline may not appear literally; ! 332: .B \en ! 333: may be typed for newline; and ! 334: .B \e/ ! 335: quotes the delimiter, here ! 336: .LR / . ! 337: Backslash is otherwise interpreted literally, except in ! 338: .B s ! 339: commands. ! 340: .PP ! 341: Most commands may be prefixed by an address to indicate their range ! 342: of operation. ! 343: Those that may not are marked with a ! 344: .L * ! 345: below. ! 346: If a command takes ! 347: an address and none is supplied, dot is used. ! 348: The sole exception is ! 349: the ! 350: .B w ! 351: command, which defaults to ! 352: .BR 0,$ . ! 353: In the description, `range' is used ! 354: to represent whatever address is supplied. ! 355: Many commands set the ! 356: value of dot as a side effect. ! 357: If so, it is always set to the `result' ! 358: of the change: the empty string for a deletion, the new text for an ! 359: insertion, etc. (but see the ! 360: .B s ! 361: and ! 362: .B e ! 363: commands). ! 364: .br ! 365: .ne 1.2i ! 366: .SS Text commands ! 367: .PD0 ! 368: .TP ! 369: .BI a/ text / ! 370: .TP ! 371: or ! 372: .TP ! 373: .B a ! 374: .TP ! 375: .I lines of text ! 376: .TP ! 377: .B . ! 378: Insert the text into the file after the range. ! 379: Set dot. ! 380: .TP ! 381: .B c\fP ! 382: .br ! 383: .ns ! 384: .TP ! 385: .B i\fP ! 386: Same as ! 387: .BR a , ! 388: but ! 389: .B c ! 390: replaces the text, while ! 391: .B i ! 392: inserts ! 393: .I before ! 394: the range. ! 395: .TP ! 396: .B d ! 397: Delete the text in the range. ! 398: Set dot. ! 399: .TP ! 400: .BI s/ regexp / text / ! 401: Substitute ! 402: .I text ! 403: for the first match to the regular expression in the range. ! 404: Set dot to the modified range. ! 405: In ! 406: .I text ! 407: the character ! 408: .B & ! 409: stands for the string ! 410: that matched the expression. ! 411: Backslash behaves as usual unless followed by ! 412: a digit: ! 413: .BI \e d ! 414: stands for the string that matched the ! 415: subexpression begun by the ! 416: .IR d -th ! 417: left parenthesis. ! 418: If ! 419: .I s ! 420: is followed immediately by a ! 421: number ! 422: .IR n , ! 423: as in ! 424: .BR s2/x/y/ , ! 425: the ! 426: .IR n -th ! 427: match in the range is substituted. ! 428: If the ! 429: command is followed by a ! 430: .BR g , ! 431: as in ! 432: .BR s/x/y/g , ! 433: all matches in the range ! 434: are substituted. ! 435: .TP ! 436: .BI m " a1 ! 437: .br ! 438: .ns ! 439: .TP ! 440: .BI t " a1 ! 441: Move the range to after ! 442: .I a1 ! 443: .RB ( m ), ! 444: or copy it ! 445: .RB ( t ). ! 446: Set dot. ! 447: .SS Display commands ! 448: .TP ! 449: .B p ! 450: Print the text in the range. ! 451: Set dot. ! 452: .TP ! 453: .B = ! 454: Print the line address and character address of the range. ! 455: .TP ! 456: .B =# ! 457: Print just the character address of the range. ! 458: .SS File commands ! 459: In these commands a ! 460: .I file-list ! 461: may be expressed ! 462: .BI < Unix-command ! 463: in which case the file names are taken as words (in the shell sense) ! 464: generated by the Unix command. ! 465: .TP ! 466: .BI \*ab " file-list ! 467: Set the current file to the first file named in the list ! 468: that ! 469: .I sam ! 470: also has in its menu. ! 471: .TP ! 472: .BI \*aB " file-list ! 473: Same as ! 474: .BR b , ! 475: except that file names not in the menu are entered there, ! 476: and all file names in the list are examined. ! 477: .TP ! 478: .B \*an ! 479: Print a menu of files. ! 480: The format is: ! 481: .RS ! 482: .TP \w'\ \ or\ blank\ \'u ! 483: .BR ' " or blank ! 484: indicating the file is modified or clean, ! 485: .TP ! 486: .BR - " or \&" + ! 487: indicating the the file is unread or has been read ! 488: (in the terminal, ! 489: .B * ! 490: means more than one window is open), ! 491: .TP ! 492: .BR . " or blank ! 493: indicating the current file, ! 494: .TP ! 495: a blank, ! 496: .TP ! 497: and the file name. ! 498: .RE ! 499: .TP 0 ! 500: .BI \*aD " file-list ! 501: Delete the named files from the menu. ! 502: If no files are named, the current file is deleted. ! 503: It is an error to ! 504: .B D ! 505: a modified file, but a subsequent ! 506: .B D ! 507: will delete such a file. ! 508: .SS I/O Commands ! 509: .TP ! 510: .BI \*ae " filename ! 511: Replace the file by the contents of the named Unix file. ! 512: Set dot to the beginning of the file. ! 513: .TP ! 514: .BI r " filename ! 515: Replace the text in the range by the contents of the named Unix file. ! 516: Set dot. ! 517: .TP ! 518: .BI w " filename ! 519: Write the range (default ! 520: .BR 0,$ ) ! 521: to the named Unix file. ! 522: .TP ! 523: .BI \*af " filename ! 524: Set the file name and print the resulting menu entry. ! 525: .PP ! 526: If the file name is absent from any of these, the current file name is used. ! 527: .B e ! 528: always sets the file name, ! 529: .B r ! 530: and ! 531: .B w ! 532: do so if the file has no name. ! 533: .TP ! 534: .BI < " Unix-command ! 535: Replace the range by the standard output of the ! 536: Unix command. ! 537: .TP ! 538: .BI > " Unix-command ! 539: Sends the range to the standard input of the ! 540: Unix command. ! 541: .TP ! 542: .BI | " Unix-command ! 543: Send the range to the standard input, and replace it by ! 544: the standard output, of the ! 545: Unix command. ! 546: .TP ! 547: .BI \*a! " Unix-command ! 548: Run the ! 549: Unix command. ! 550: .TP ! 551: .BI \*acd " directory ! 552: Change working directory. ! 553: If no directory is specified, ! 554: .B $HOME ! 555: is used. ! 556: .PP ! 557: In any of ! 558: .BR < , ! 559: .BR > , ! 560: .B | ! 561: or ! 562: .BR ! , ! 563: if the ! 564: .I Unix command ! 565: is omitted the last ! 566: .I Unix command ! 567: (of any type) is substituted. ! 568: If ! 569: .I sam ! 570: is downloaded, ! 571: .B ! ! 572: sets standard input to ! 573: .FR /dev/null , ! 574: and otherwise ! 575: unassigned output ! 576: .RB ( stdout ! 577: for ! 578: .B ! ! 579: and ! 580: .BR > , ! 581: .B stderr ! 582: for all) is placed in ! 583: .F $HOME/sam.err ! 584: and the first few lines are printed. ! 585: .SS Loops and Conditionals ! 586: .TP ! 587: .BI x/ regexp / " command ! 588: For each match of the regular expression in the range, run the command ! 589: with dot set to the match. ! 590: Set dot to the last match. ! 591: If the regular ! 592: expression and its slashes are omitted, ! 593: .L /.*\en/ ! 594: is assumed. ! 595: Null string matches potentially occur before every character ! 596: of the range and at the end of the range. ! 597: .TP ! 598: .BI y/ regexp / " command ! 599: Like ! 600: .B x, ! 601: but run the command for each substring that lies before, between, ! 602: or after ! 603: the matches that would be generated by ! 604: .BR x . ! 605: There is no default behavior. ! 606: Null substrings potentially occur before every character ! 607: in the range. ! 608: .TP ! 609: .BI \*aX/ regexp / " command ! 610: For each file whose menu entry matches the regular expression, ! 611: run the command. ! 612: If the expression is omitted, the command is run ! 613: in every file. ! 614: .TP ! 615: .BI \*aY/ regexp / " command ! 616: Same as ! 617: .BR X , ! 618: but for files that do not match the regular expression, ! 619: and the expression is required. ! 620: .TP ! 621: .BI g/ regexp / " command ! 622: .br ! 623: .ns ! 624: .TP ! 625: .BI v/ regexp / " command ! 626: If the range contains ! 627: .RB ( g ) ! 628: or does not contain ! 629: .RB ( v ) ! 630: a match for the expression, ! 631: set dot to the range and run the command. ! 632: .PP ! 633: These may be nested arbitrarily deeply, but only one instance of either ! 634: .B X ! 635: or ! 636: .B Y ! 637: may appear in a \%single command. ! 638: An empty command in an ! 639: .B x ! 640: or ! 641: .B y ! 642: defaults to ! 643: .BR p ; ! 644: an empty command in ! 645: .B X ! 646: or ! 647: .B Y ! 648: defaults to ! 649: .BR f . ! 650: .B g ! 651: and ! 652: .B v ! 653: do not have defaults. ! 654: .SS Miscellany ! 655: .TP ! 656: .B k ! 657: Set the current file's mark to the range. Does not set dot. ! 658: .TP ! 659: .B \*aq ! 660: Quit. ! 661: It is an error to quit with modified files, but a second ! 662: .B q ! 663: will succeed. ! 664: .TP ! 665: .BI \*au " n ! 666: Undo the last ! 667: .I n ! 668: (default 1) ! 669: top-level commands that changed the contents or name of the ! 670: current file, and any other file whose most recent change was simultaneous ! 671: with the current file's change. ! 672: Successive ! 673: .BR u 's ! 674: move further back in time. ! 675: The only commands for which u is ineffective are ! 676: .BR cd , ! 677: .BR u , ! 678: .BR q , ! 679: .B w ! 680: and ! 681: .BR D . ! 682: .TP ! 683: (empty) ! 684: If the range is explicit, set dot to the range. ! 685: If ! 686: .I sam ! 687: is downloaded, the resulting dot is selected on the screen; ! 688: otherwise it is printed. ! 689: If no address is specified (the ! 690: command is a newline) dot is extended in either direction to ! 691: line boundaries and printed. ! 692: If dot is thereby unchanged, it is set to ! 693: .B .+1 ! 694: and printed. ! 695: .PD ! 696: .SS Grouping and multiple changes ! 697: Commands may be grouped by enclosing them in braces ! 698: .BR {} . ! 699: Commands within the braces must appear on separate lines (no backslashes are ! 700: required between commands). ! 701: Semantically, an opening brace is like a command: ! 702: it takes an (optional) address and sets dot for each sub-command. ! 703: Commands within the braces are executed sequentially, but changes made ! 704: by one command are not visible to other commands (see the next section ! 705: of this manual). ! 706: Braces may be nested arbitrarily. ! 707: .PP ! 708: When a command makes a number of changes to a file, as in ! 709: .BR x/re/c/text/ , ! 710: the addresses of all changes to the file are computed in the original file. ! 711: If the changes are in sequence, ! 712: they are applied to the file. ! 713: Successive insertions at the same address are catenated into a single ! 714: insertion composed of the several insertions in the order applied. ! 715: .SS The terminal ! 716: What follows refers to behavior of ! 717: .I sam ! 718: when downloaded, that is, when ! 719: operating as a display editor on a bitmap display. ! 720: This is the default ! 721: behavior; invoking ! 722: .I sam ! 723: with the ! 724: .B -d ! 725: (no download) option provides access ! 726: to the command language only. ! 727: .PP ! 728: Each file may have zero or more windows open. ! 729: Each window is equivalent ! 730: and is updated simultaneously with changes in other windows on the same file. ! 731: Each window has an independent value of dot, indicated by a highlighted ! 732: substring on the display. ! 733: Dot may be in a region not within ! 734: the window. ! 735: There is usually a `current window', ! 736: marked with a dark border, to which typed text and editing ! 737: commands apply. ! 738: Text may be typed and edited as in ! 739: .IR mux (9.1); ! 740: also the escape key (ESC) selects (sets dot to) text typed ! 741: since the last mouse button hit. ! 742: .PP ! 743: The button 3 menu controls window operations. ! 744: The top of the menu ! 745: provides the following operators, each of which prompts with one or ! 746: more ! 747: .IR mux -like ! 748: cursors to prompt for selection of a window or sweeping ! 749: of a rectangle. ! 750: `Sweeping' a null rectangle gets a large window, disjoint ! 751: from the command window or the whole screen, depending on ! 752: where the null rectangle is. ! 753: .TF reshape ! 754: .TP ! 755: .B new ! 756: Create a new, empty file. ! 757: .TP ! 758: .B xerox ! 759: Create a copy of an existing window. ! 760: .TP ! 761: .B reshape ! 762: As in ! 763: .I mux. ! 764: .TP ! 765: .B close ! 766: Delete the window. ! 767: In the last window of a file, ! 768: .B close ! 769: is equivalent to a ! 770: .B D ! 771: for the file. ! 772: .TP ! 773: .B write ! 774: Equivalent to a ! 775: .B w ! 776: for the file. ! 777: .PD ! 778: .PP ! 779: Below these operators is a list of available files, starting with ! 780: .BR ~~sam~~ , ! 781: the command window. ! 782: Selecting a file from the list makes the most recently ! 783: used window on that file current, unless it is already current, in which ! 784: case selections cycle through the open windows. ! 785: If no windows are open ! 786: on the file, the user is prompted to open one. ! 787: Files other than ! 788: .B ~~sam~~ ! 789: are marked with one of the characters ! 790: .B -+* ! 791: according as zero, one, or more windows ! 792: are open on the file. ! 793: A further mark ! 794: .L . ! 795: appears on the file in the current window and ! 796: a single quote, ! 797: .BR ' , ! 798: on a file modified since last write. ! 799: .PP ! 800: Nothing can be done without a command window, for which ! 801: .I sam ! 802: prompts initially. ! 803: The command window is an ordinary window except that text typed to it ! 804: is interpreted as commands for the editor rather than passive text, ! 805: and text printed by editor commands appears in it. ! 806: The behavior is like ! 807: .I mux, ! 808: with a `command point' that separates commands being typed from ! 809: previous output. ! 810: Commands typed in the command window apply to the ! 811: current open file\(emthe file in the most recently ! 812: current window. ! 813: .SS Manipulating text ! 814: Button 1 changes selection, much like ! 815: .I mux. ! 816: Pointing to a non-current window with button 1 makes it current; ! 817: within the current window, button 1 selects text, thus setting dot. ! 818: Double-clicking selects text to the boundaries of words, lines, ! 819: quoted strings or bracketed strings, depending on the text at the click. ! 820: .PP ! 821: Button 2 provides a menu of editing commands: ! 822: .PD0 ! 823: .TP ! 824: .B cut ! 825: Delete dot and save the deleted text in the snarf buffer. ! 826: .TP ! 827: .B paste ! 828: Replace the text in dot by the contents of the snarf buffer. ! 829: .TP ! 830: .B snarf ! 831: Save the text in dot in the snarf buffer. ! 832: .TP ! 833: .B look ! 834: Search forward for the next occurrence of the literal text in dot. ! 835: If dot is the null string, the text in the snarf buffer is ! 836: used. ! 837: The snarf buffer is unaffected. ! 838: .TP ! 839: .B <mux> ! 840: Exchange snarf buffers with ! 841: .IR mux. ! 842: .TP ! 843: .BI / regexp ! 844: Search forward for the next match of the last regular expression ! 845: typed in a command. ! 846: (Not in command window.) ! 847: .TP ! 848: .B send ! 849: Send the text in dot, or the snarf buffer if ! 850: dot is the null string, as if it were typed to the command window. ! 851: Saves the sent text in the snarf buffer. ! 852: (Command window only.) ! 853: .TP ! 854: .B scroll ! 855: .TP ! 856: .B noscroll ! 857: Select whether to reveal automatically text ! 858: that appears off the end of the command window. ! 859: (Command window only.) ! 860: .PD ! 861: .SS Abnormal termination ! 862: If ! 863: .I sam ! 864: terminates other than by a ! 865: .B q ! 866: command (by hangup, deleting its layer, etc.), modified ! 867: files are saved in an ! 868: executable file, ! 869: .FR $HOME/sam.save . ! 870: This program, when executed, asks whether to write ! 871: each file back to a Unix file. ! 872: The answer ! 873: .L y ! 874: causes writing; anything else skips the file. ! 875: .SH FILES ! 876: .F $HOME/sam.save ! 877: .br ! 878: .F $HOME/sam.err ! 879: .SH SEE ALSO ! 880: .IR ed (1), ! 881: .IR sed (1), ! 882: .IR vi (1), ! 883: .IR gre (1) ! 884: .SH BUGS ! 885: The ! 886: .B u ! 887: command undoes characters\(emand backspaces\(emtyped directly ! 888: into a file window in unpredictable increments.
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