.NHText Processing.NH 2Document Preparation.LP.sh EDInteractive context editor.Random access to all lines of a file..opFind lines by number or pattern.Patterns may include:specified characters,don't care characters,choices among characters,repetitions of these constructs,beginning of line,end of line..opAdd, delete, change, copy, move or join lines..opPermute or split contents of a line..opReplace one or all instances of a pattern within a line..opCombine or split files..opEscape to Shell (command language) during editing..ne3.opDo any of above operations onevery pattern-selected line in a given range..OPOptional encryption for extra security..sh PTXMake a permuted (key word in context) index..sh SPELLLook for spelling errors by comparing each word in adocument against a word list..OP25,000-word list includes proper names..OPHandles common prefixes and suffixes..OPCollects words to help tailor local spelling lists..sh LOOKSearch for words in dictionary that begin with specified prefix..sh TYPOLook for spelling errors by a statistical technique;not limited to English..sh CRYPTEncrypt and decrypt files for security..NH 2Document Formatting.LP.sh ROFFA typesetting program for terminals.Easy for nontechnical people to learn, and goodfor simple documents.Input consists of data lines intermixed with control lines,such as.ta  8n.ti 10.li.sp 2	insert two lines of space.ti10.li.ce	center the next line.brROFF is deemed to be obsolete;it is intended only for casual use..opJustification of either or both margins..opAutomatic hyphenation..opGeneralized running heads and feet, with even-odd pagecapability, numbering, etc..opDefinable macros for frequently usedcontrol sequences (no substitutable arguments)..opAll 4 margins and page size dynamically adjustable..opHanging indents and one-line indents..opAbsolute and relative parameter settings..opOptional legal-style numbering of output lines..opMultiple file capability..OPNot usable as a filter..sh TROFF.sh NROFFAdvanced typesetting.TROFF drives a Graphic Systems phototypesetter;NROFF drives ascii terminals of all types.This summary was typeset using TROFF.TROFF and NROFF style is similar to ROFF, but they are capable of much more elaboratefeats of formatting,when appropriately programmed.TROFF and NROFF accept the same input language..opAll ROFF capabilities available or definable..opCompletely definable page format keyed to dynamically planted``interrupts'' at specified lines..opMaintains several separately definable typesetting environments (e.g., one forbody text, one for footnotes, and one for unusually elaborateheadings)..opArbitrary number of output pools can be combined at will..opMacros with substitutable arguments, and macros invocablein mid-line..opComputation and printing of numerical quantities..opConditional execution of macros..opTabular layout facility..opPositions expressible in inches, centimeters, ems, points,machine unitsor arithmetic combinations thereof..opAccess to character-width computation for unusually difficultlayout problems..opOverstrikes, built-up brackets, horizontal and vertical line drawing..opDynamic relative or absolute positioning and size selection,globally or at the character level..opCan exploit the characteristics of the terminal being used,for approximating special characters, reverse motions,proportional spacing, etc..LPThe Graphic Systems typesetter has avocabulary of several 102-character fonts (4 simultaneously)in 15 sizes.TROFF providesterminal output for rough sampling of the product..LPNROFF will produce multicolumn output on terminals capable of reverse line feed,or through the postprocessor COL..LPHigh programming skill is required to exploit the formattingcapabilities of TROFF and NROFF, although unskilled personnel can easily be trainedto enter documents according to canned formatssuch as those provided by MS, below.TROFF and EQN are essentially identical to NROFF and NEQNso it is usually possible to define interchangeable formats to produceapproximate proof copy on terminalsbefore actual typesetting.The preprocessors MS, TBL, and REFER are fully compatiblewith TROFF and NROFF..sh MSA standardized manuscript layout packagefor use with NROFF/TROFF.This document was formatted with MS..opPage numbers and draft dates..opAutomatically numbered subheads..opFootnotes..opSingle or double column..opParagraphing, display and indentation..opNumbered equations..sh EQNA mathematical typesetting preprocessor for TROFF.Translates easily readable formulas, either in-line or displayed, into detailed typesetting instructions.Formulas are written in a style like this:.DSsigma sup 2 ~=~ 1 over N sum from i=1 to N ( x sub i \- x bar ) sup 2.DEwhich produces:.EQsigma sup 2 ~=~ 1 over N sum from i=1 to N ( x sub i - x bar ) sup 2.EN.opAutomatic calculation of size changes for subscripts, sub-subscripts,etc..opFull vocabulary of Greek letters and special symbols, such as `gamma', `GAMMA', `integral'..opAutomatic calculation of large bracket sizes..opVertical ``piling'' of formulae for matrices, conditionalalternatives, etc..opIntegrals, sums, etc., with arbitrarily complex limits..opDiacriticals: dots, double dots, hats, bars, etc..opEasily learned by nonprogrammers and mathematical typists..sh NEQNA version of EQN for NROFF;accepts the same input language.Prepares formulas for display onany terminal that NROFF knows about,for example, those based on Diablo printing mechanism..opSame facilities as EQN within graphical capability ofterminal..sh TBLA preprocessor for NROFF/TROFFthat translates simple descriptions of table layoutsand contents into detailed typesetting instructions..opComputes column widths..opHandles left- and right-justified columns,centered columns and decimal-pointalignment..opPlaces column titles..opTable entries can be text,which is adjusted to fit..opCan box all or parts of table..sh REFERFills in bibliographic citations in a documentfrom a data base (not supplied)..opReferences may be printed in any style,as they occur or collected at the end..opMay be numbered sequentially, by name of author, etc..sh TCSimulate Graphic Systems typesetter on Tektronix 4014 scope.Useful for checking TROFF page layout before typesetting..sh GREEKFancy printing on Diablo-mechanism terminalslike DASI-300 and DASI-450,and on Tektronix 4014..opGives half-line forward and reverse motions..opApproximates Greek letters and other special charactersby overstriking..sh COLCanonicalize files with reverse line feedsfor one-pass printing..sh DEROFFRemove all TROFF commands from input..sh CHECKEQCheck document for possible errors in EQN usage.