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All Rights Reserved. .\" Copyright (c) 2004, Sun Microsystems, Inc. All Rights Reserved. .\" .TH EX 1HAS "Jun 15, 2004" .SH NAME ex \- text editor .SH SYNOPSIS .LP .nf \fB/usr/bin/ex\fR [\fB-|\fR \fB-s\fR] [\fB-l\fR] [\fB-L\fR] [\fB-R\fR] [\fB-r\fR [\fIfile\fR]] [\fB-t\fR \fItag\fR] [\fB-v\fR] [\fB-V\fR] [\fB-x\fR] [\fB-w\fR\fIn\fR] [\fB-C\fR] [+\fIcommand\fR | \fB-c\fR \fIcommand\fR] \fIfile\fR... .fi .LP .nf \fB/usr/xpg4/bin/ex\fR [\fB-|\fR \fB-s\fR] [\fB-l\fR] [\fB-L\fR] [\fB-R\fR] [\fB-r\fR [\fIfile\fR]] [\fB-t\fR \fItag\fR] [\fB-v\fR] [\fB-V\fR] [\fB-x\fR] [\fB-w\fR\fIn\fR] [\fB-C\fR] [+\fIcommand\fR | \fB-c\fR \fIcommand\fR] \fIfile\fR... .fi .LP .nf \fB/usr/xpg6/bin/ex\fR [\fB-|\fR \fB-s\fR] [\fB-l\fR] [\fB-L\fR] [\fB-R\fR] [\fB-r\fR [\fIfile\fR]] [\fB-t\fR \fItag\fR] [\fB-v\fR] [\fB-V\fR] [\fB-x\fR] [\fB-w\fR\fIn\fR] [\fB-C\fR] [+\fIcommand\fR | \fB-c\fR \fIcommand\fR] \fIfile\fR... .fi .SH DESCRIPTION .sp .LP The \fBex\fR utility is the root of a family of editors: \fBex\fR and \fBvi\fR. \fBex\fR is a superset of \fBed\fR(1), with the most notable extension being a display editing facility. Display based editing is the focus of \fBvi\fR. .sp .LP If you have a \fBCRT\fR terminal, you can wish to use a display based editor; in this case see \fBvi\fR(1), which is a command which focuses on the display-editing portion of \fBex\fR. .sp .LP If you have used \fBed\fR you find that, in addition to having all of the \fBed\fR commands available, \fBex\fR has a number of additional features useful on \fBCRT\fR terminals. Intelligent terminals and high speed terminals are very pleasant to use with \fBvi\fR. Generally, the \fBex\fR editor uses far more of the capabilities of terminals than \fBed\fR does, and uses the terminal capability data base (see \fBterminfo\fR(4)) and the type of the terminal you are using from the environment variable \fBTERM\fR to determine how to drive your terminal efficiently. The editor makes use of features such as insert and delete character and line in its \fBvisual\fR command (which can be abbreviated \fBvi\fR) and which is the central mode of editing when using the \fBvi\fR command. .sp .LP The \fBex\fR utility contains a number of features for easily viewing the text of the file. The \fBz\fR command gives easy access to windows of text. Typing \fB^D\fR (CTRL-D) causes the editor to scroll a half-window of text and is more useful for quickly stepping through a file than just typing return. Of course, the screen-oriented \fBvisual\fR mode gives constant access to editing context. .sp .LP The \fBex\fR utility gives you help when you make mistakes. The \fBundo\fR (\fBu\fR) command allows you to reverse any single change which goes astray. \fBex\fR gives you a lot of feedback, normally printing changed lines, and indicates when more than a few lines are affected by a command so that it is easy to detect when a command has affected more lines than it should have. .sp .LP The editor also normally prevents overwriting existing files, unless you edited them, so that you do not accidentally overwrite a file other than the one you are editing. If the system (or editor) crashes, or you accidentally hang up the telephone, you can use the editor \fBrecover\fR command (or \fB-r\fR\fI file\fR option) to retrieve your work. This gets you back to within a few lines of where you left off. .sp .LP The \fBex\fR utility has several features for dealing with more than one file at a time. You can give it a list of files on the command line and use the \fBnext\fR (\fBn\fR) command to deal with each in turn. The \fBnext\fR command can also be given a list of file names, or a pattern as used by the shell to specify a new set of files to be dealt with. In general, file names in the editor can be formed with full shell metasyntax. The metacharacter `%' is also available in forming file names and is replaced by the name of the current file. .sp .LP The editor has a group of buffers whose names are the ASCII lower-case letters (\fBa\fR-\fBz\fR). You can place text in these named buffers where it is available to be inserted elsewhere in the file. The contents of these buffers remain available when you begin editing a new file using the \fBedit\fR (\fBe\fR) command. .sp .LP There is a command \fB&\fR in \fBex\fR which repeats the last \fBsubstitute\fR command. In addition, there is a confirmed substitute command. You give a range of substitutions to be done and the editor interactively asks whether each substitution is desired. .sp .LP It is possible to ignore the case of letters in searches and substitutions. \fBex\fR also allows regular expressions which match words to be constructed. This is convenient, for example, in searching for the word ``edit'' if your document also contains the word ``editor.'' .sp .LP \fBex\fR has a set of options which you can set to tailor it to your liking. One option which is very useful is the \fBautoindent\fR option that allows the editor to supply leading white space to align text automatically. You can then use \fB^D\fR as a backtab and space or tab to move forward to align new code easily. .sp .LP Miscellaneous useful features include an intelligent \fBjoin\fR (\fBj\fR) command that supplies white space between joined lines automatically, commands \fB<\fR and \fB>\fR which shift groups of lines, and the ability to filter portions of the buffer through commands such as \fBsort\fR. .SH OPTIONS .sp .LP The following options are supported: .sp .ne 2 .na \fB\fB\(mi\fR | \fB-s\fR\fR .ad .RS 25n Suppresses all interactive user feedback. This is useful when processing editor scripts. .RE .sp .ne 2 .na \fB\fB-l\fR\fR .ad .RS 25n Sets up for editing \fBLISP\fR programs. .RE .sp .ne 2 .na \fB\fB-L\fR\fR .ad .RS 25n Lists the name of all files saved as the result of an editor or system crash. .RE .sp .ne 2 .na \fB\fB-R\fR\fR .ad .RS 25n \fBReadonly\fR mode. The \fBreadonly\fR flag is set, preventing accidental overwriting of the file. .RE .sp .ne 2 .na \fB\fB-r\fR \fIfile\fR\fR .ad .RS 25n Edits \fIfile\fR after an editor or system crash. (Recovers the version of \fIfile\fR that was in the buffer when the crash occurred.) .RE .sp .ne 2 .na \fB\fB-t\fR \fItag\fR\fR .ad .RS 25n Edits the file containing the \fItag\fR and positions the editor at its definition. It is an error to specify more than one \fB-t\fR option. .RE .sp .ne 2 .na \fB\fB-v\fR\fR .ad .RS 25n Starts up in display editing state, using \fBvi\fR. You can achieve the same effect by typing the \fBvi\fR command itself. .RE .sp .ne 2 .na \fB\fB-V\fR\fR .ad .RS 25n Verbose. When \fBex\fR commands are read by means of standard input, the input is echoed to standard error. This can be useful when processing \fBex\fR commands within shell scripts. .RE .sp .ne 2 .na \fB\fB-x\fR\fR .ad .RS 25n Encryption option. Simulates the \fBX\fR command and prompts the user for a key. This key is used to encrypt and decrypt text using the algorithm of the \fBcrypt\fR command. The \fBX\fR command makes an educated guess to determine whether text read in is encrypted or not. The temporary buffer file is encrypted also, using a transformed version of the key typed in for the \fB-x\fR option. .RE .sp .ne 2 .na \fB\fB-w\fR\fIn\fR\fR .ad .RS 25n Sets the default window size to \fIn\fR. This is useful when using the editor over a slow speed line. .RE .sp .ne 2 .na \fB\fB-C\fR\fR .ad .RS 25n Encryption option. Same as the \fB-x\fR option, except that \fB-C\fR simulates the \fBC\fR command. The \fBC\fR command is like the \fBX\fR command, except that all text read in is assumed to have been encrypted. .RE .sp .ne 2 .na \fB\fB+\fR\fIcommand\fR | \fB-c\fR\fI command\fR\fR .ad .RS 25n Begins editing by executing the specified editor \fIcommand\fR (usually a search or positioning command). .RE .sp .ne 2 .na \fB\fB/usr/xpg4/bin/ex\fR, \fB/usr/xpg6/bin/ex\fR\fR .ad .sp .6 .RS 4n If both the \fB-t\fR\fI tag\fR and the \fB-c\fR\fI command\fR options are given, the \fB-t\fR\fI tag\fR is processed first. That is, the file containing the tag is selected by \fB-t\fR and then the command is executed. .RE .SH OPERANDS .sp .LP The following operand is supported: .sp .ne 2 .na \fB\fIfile\fR\fR .ad .RS 8n A path name of a file to be edited. .RE .SH USAGE .sp .LP This section defines the \fBex\fR states, commands, initializing options, and scanning pattern formations. .SS "ex States" .sp .ne 2 .na \fBCommand\fR .ad .RS 11n Normal and initial state. Input prompted for by "\fB:\fR". The line kill character cancels a partial command. .RE .sp .ne 2 .na \fBInsert\fR .ad .RS 11n Entered by \fBa\fR, \fBi\fR, or \fBc\fR. Arbitrary text can be entered. Insert state normally is terminated by a line having only "\fB\&.\fR" on it, or, abnormally, with an interrupt. .RE .sp .ne 2 .na \fBVisual\fR .ad .RS 11n Entered by typing \fBvi\fR. Terminated by typing \fBQ\fR or ^\e (Control-\e). .RE .SS "ex Command Names and Abbreviations" .sp .in +2 .nf Command Abbrevi- Command Abbrevi- Command Abbrevi- Name ation Name ation Name ation abbrev ab map set se append a mark ma shell sh args ar move m source so change c next n substitute s copy co number nu unabbrev unab delete d preserve pre undo u edit e print p unmap unm file f put pu version ve global g quit q visual vi insert i read r write w join j recover rec xit x list l rewind rew yank ya .fi .in -2 .sp .SS "Join Command Arguments" .sp .in +2 .nf Join [\fIrange\fR] j[\fIoin\fR][!] [\fIcount\fR] [\fIflags\fR] .fi .in -2 .sp .sp .LP If count is specified: .sp .ne 2 .na \fB\fB/usr/bin/ex\fR, \fB/usr/xpg6/bin/ex\fR\fR .ad .sp .6 .RS 4n If no address is specified, the\fB join\fR command behaves as if \fI2addr\fR were the current line and the current line plus \fIcount\fR (\fB\&.,. +\fR\fI count\fR). If one address is specified, the \fBjoin\fR command behaves as if \fI2addr\fR were the specified address and the specified address plus \fIcount\fR ( \fIaddr\fR\fB,\fR \fIaddr\fR \fB+\fR \fIcount\fR). .RE .sp .ne 2 .na \fB\fB/usr/xpg4/bin/ex\fR\fR .ad .sp .6 .RS 4n If no address is specified, the \fBjoin\fR command behaves as if \fI2addr \fRwere the current line and the current line plus \fIcount \fR\fB-1\fR (\fB\&.,. +\fR \fIcount\fR \fB-1\fR). If one address is specified, the \fBjoin\fR command behaves as if \fI2addr\fR were the specified address and the specified address plus \fIcount\fR \fB-1\fR ( \fIaddr\fR\fB,\fR \fIaddr\fR \fB+\fR \fIcount\fR \fB-1\fR). .RE .sp .ne 2 .na \fB\fB/usr/bin/ex\fR, \fB/usr/xpg4/bin/ex\fR, \fB/usr/xpg6/bin/ex\fR\fR .ad .sp .6 .RS 4n If two or more addresses are specified, the \fBjoin\fR command behaves as if an additional address, equal to the last address plus \fIcount\fR \fB-1\fR (\fIaddr1\fR\fB, ...,\fR \fIlastaddr\fR\fB,\fR \fIlastaddr\fR + \fIcount\fR \fB-1\fR), was specified. If this results in a second address greater than the last line of the edit buffer, it is corrected to be equal to the last line of the edit buffer. .RE .sp .LP If no count is specified: .sp .ne 2 .na \fB\fB/usr/bin/ex\fR, \fB/usr/xpg4/bin/ex\fR, \fB/usr/xpg6/bin/ex\fR\fR .ad .sp .6 .RS 4n If no address is specified, the \fBjoin\fR command behaves as if \fI2addr\fR were the current line and the next line (\fB\&.,. +1\fR). If one address is specified, the \fBjoin\fR command behaves as if \fI2addr\fR were the specified address and the next line ( \fIaddr\fR\fB,\fR \fIaddr\fR \fB+1\fR). .RE .SS "Additional ex Command Arguments" .sp .ne 2 .na \fB\fB/usr/bin/ex\fR, \fB/usr/xpg6/bin/ex\fR\fR .ad .sp .6 .RS 4n For the following \fBex\fR commands, if \fIcount\fR is specified, it is equivalent to specifying an additional address to the command. The additional address is equal to the last address specified to the command (either explicitly or by default) plus \fIcount\fR\fB-1\fR. If this results in an address greater than the last line of the edit buffer, it is corrected to equal the last line of the edit buffer. .RE .sp .ne 2 .na \fB\fB/usr/xpg4/bin/ex\fR\fR .ad .sp .6 .RS 4n For the following \fBex\fR commands, if both a count and a range are specified for a command that uses them, the number of lines affected is taken from the count value rather than the range. The starting line for the command is taken to be the first line addressed by the range. .RE .sp .sp .TS l l l l . Abbreviate ab[brev] word rhs Append [line]a[ppend][!] Arguments ar[gs] Change [range] c[hange][!] [count] Change Directory T{ chd[ir][!] [directory]; cd[!] [directory] T} Copy T{ [range] co[py] line [flags]; [range] t line [flags] T} Delete T{ [range] d[elete] [buffer] [count] [flags] T} Edit T{ e[dit][!] [+line][file]; ex[!] [+line] [file] T} File f[ile] [file] Global T{ [range] g[lobal] /pattern/ [commands]; [range] v /pattern/ [commands] T} Insert [line] i[nsert][!] List [range] l[ist] [count] [flags] Map map[!] [x rhs] Mark [line] ma[rk] x; [line] k x Move [range] m[ove] line Next n[ext][!] [file ...] Open [line] o[pen] /pattern/ [flags] Preserve pre[serve] Put [line] pu[t] [buffer] Quit q[uit][!] Read [line] r[ead][!] [file] Recover rec[over] file Rewind rew[ind][!] Set T{ se[t] [option[=[value]]...] [nooption...] [option?...] [all] T} Shell sh[ell] Source so[urce] file Suspend su[spend][!]; st[op][!] Tag ta[g][!] tagstring Unabbreviate una[bbrev] word Undo u[ndo] Unmap unm[ap][!] x Visual [line] v[isual] [type] [count] [flags] Write T{ [range] w[rite][!] [>>] [file]; [range] w[rite][!] [file]; [range] wq[!] [>>] [file] T} Write and Exit [range] x[it][!] [file] Yank [range] ya[nk] [buffer] [count] Adjust Window [line] z [type] [count] [flags] Escape ! command [range]! command Scroll EOF Write Line Number [line] = [flags] Execute @ buffer; * buffer .TE .sp .ne 2 .na \fB\fB/usr/bin/ex\fR, \fB/usr/xpg4/bin/ex\fR, \fB/usr/xpg6/bin/ex\fR\fR .ad .sp .6 .RS 4n For the following \fBex\fR commands, if \fIcount\fR is specified, it is equivalent to specifying an additional address to the command. The additional address is equal to the last address specified to the command (either explicitly or by default) plus \fIcount\fR\fB-1\fR. If this results in an address greater than the last line of the edit buffer, it is corrected to equal the last line of the edit buffer. .RE .sp .sp .TS l l l l . Number T{ [range] nu[mber] [count] [flags]; [range] | # [count] [flags] T} Print [range] p[rint] [count] [flags] Substitute T{ [range] s[ubstitute] [/pattern/repl/[options] [count] [flags]] T} Shift Left [range] < [count] [flags] Shift Right [range] > [count] [flags] Resubstitute T{ [range] & [options] [count] [flags]; [range] s[ubstitute] [options] [count] [flags]; [range] ~ [options] [count [flags] T} .TE .SS "ex Commands" .sp .sp .TS l l l l . \fBC\fR forced encryption \fBX\fR heuristic encryption \fB&\fR resubst \fBCR\fR print next \fB>\fR rshift \fB<\fR lshift \fB^D\fR scroll \fBz\fR window \fB!\fR shell escape .TE .SS "ex Command Addresses" .sp .sp .TS l l l l . \fIn\fR line \fIn\fR \fB\&.\fR current \fB$\fR last \fB+\fR next \fB-\fR previous \fB+\fR\fIn\fR \fIn\fR forward \fB%\fR 1,$ \fB/\fR\fIpat\fR next with \fIpat\fR \fB?\fR\fIpat\fR previous with \fIpat\fR \fIx\fR\fB-\fR\fIn\fR \fIn\fR before \fIx\fR \fIx\fR\fB,\fR\fIy\fR \fIx\fR through \fIy\fR \fB\&'\fR\fIx\fR marked with \fIx\fR \fB"\fR previous context .TE .SS "Initializing Options" .sp .sp .TS l l l l . \fBEXINIT\fR place \fBset\fR's here in environment variable \fB$HOME/.exrc\fR editor initialization file \fB\&./.exrc\fR editor initialization file \fBset\fR \fIx\fR enable option \fIx\fR \fBset\fR \fBno\fR\fIx\fR disable option \fIx\fR \fBset\fR \fIx\fR=\fIval\fR give value \fIval\fR to option \fIx\fR \fBset\fR show changed options \fBset\fR \fBall\fR show all options \fBset\fR \fIx\fR\fB?\fR show value of option \fIx\fR .TE .SS "Useful Options and Abbreviations" .sp .sp .TS l l l l l l . autoindent \fBai\fR supply indent autowrite \fBaw\fR write before changing files directory T{ pathname of directory for temporary work files T} exrc \fBex\fR T{ allow \fBvi\fR/\fBex\fR to read the \fB\&.exrc\fR in the current directory. This option is set in the \fBEXINIT\fR shell variable or in the \fB\&.exrc\fR file in the \fB$\fR\fBHOME\fRdirectory. T} ignorecase \fBic\fR ignore case of letters in scanning list print \fB^I\fR for tab, $ at end magic treat \fB\&. [ *\fR special in patterns modelines T{ first five lines and last five lines executed as \fBvi\fR/\fBex\fR commands if they are of the form \fBex:\fR\fBcommand\fR\fB:\fR or \fBvi:\fR\fBcommand\fR\fB:\fR T} number \fBnu\fR number lines paragraphs \fBpara\fR macro names that start paragraphs redraw simulate smart terminal report T{ informs you if the number of lines modified by the last command is greater than the value of the \fBreport\fR variable T} scroll command mode lines sections \fBsect\fR macro names that start sections shiftwidth \fBsw\fR for \fB< >\fR, and input \fB^D\fR showmatch \fBsm\fR to \fB)\fR and \fB}\fR as typed showmode \fBsmd\fR show insert mode in \fB vi\fR slowopen \fBslow\fR stop updates during insert term T{ specifies to \fBvi\fR the type of terminal being used (the default is the value of the environment variable \fBTERM\fR) T} window visual mode lines wrapmargin \fBwm\fR automatic line splitting wrapscan \fBws\fR T{ search around end (or beginning) of buffer T} .TE .SS "Scanning Pattern Formation" .sp .sp .TS l l l l . \fB^\fR beginning of line \fB$\fR end of line \fB\&.\fR any character \fB\e<\fR beginning of word \fB\e>\fR end of word \fB[\fR\fIstr\fR\fB]\fR any character in \fIstr\fR \fB[^\fR\fIstr\fR\fB]\fR any character not in \fIstr\fR \fB[\fR\fIxy\fR\fB]\fR any character between \fIx\fR and \fIy\fR \fB*\fR any number of preceding characters .TE .SH ENVIRONMENT VARIABLES .sp .LP See \fBenviron\fR(5) for descriptions of the following environment variables that affect the execution of \fBex\fR: \fBHOME\fR, \fBLANG\fR, \fBLC_ALL\fR, \fBLC_COLLATE\fR, \fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, \fBNLSPATH\fR, \fBPATH\fR, \fBSHELL\fR, and \fBTERM\fR. .sp .ne 2 .na \fB\fBCOLUMNS\fR\fR .ad .RS 11n Override the system-selected horizontal screen size. .RE .sp .ne 2 .na \fB\fBEXINIT\fR\fR .ad .RS 11n Determine a list of \fBex\fR commands that are executed on editor start-up, before reading the first file. The list can contain multiple commands by separating them using a vertical-line (\fB|\fR) character. .RE .sp .ne 2 .na \fB\fBLINES\fR\fR .ad .RS 11n Override the system-selected vertical screen size, used as the number of lines in a screenful and the vertical screen size in visual mode. .RE .SH EXIT STATUS .sp .LP The following exit values are returned: .sp .ne 2 .na \fB\fB0\fR\fR .ad .RS 6n Successful completion. .RE .sp .ne 2 .na \fB\fB>0\fR\fR .ad .RS 6n An error occurred. .RE .SH FILES .sp .ne 2 .na \fB\fB/var/tmp/Ex\fInnnnn\fR\fR\fR .ad .RS 29n editor temporary .RE .sp .ne 2 .na \fB\fB/var/tmp/Rx\fInnnnn\fR\fR\fR .ad .RS 29n named buffer temporary .RE .sp .ne 2 .na \fB\fB/usr/lib/expreserve\fR\fR .ad .RS 29n preserve command .RE .sp .ne 2 .na \fB\fB/usr/lib/exrecover\fR\fR .ad .RS 29n recover command .RE .sp .ne 2 .na \fB\fB/usr/lib/exstrings\fR\fR .ad .RS 29n error messages .RE .sp .ne 2 .na \fB\fB/usr/share/lib/terminfo/*\fR\fR .ad .RS 29n describes capabilities of terminals .RE .sp .ne 2 .na \fB\fB/var/preserve/login\fR\fR .ad .RS 29n preservation directory (where \fBlogin\fR is the user's login) .RE .sp .ne 2 .na \fB\fB$HOME/.exrc\fR\fR .ad .RS 29n editor startup file .RE .sp .ne 2 .na \fB\fB\&./.exrc\fR\fR .ad .RS 29n editor startup file .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(5) for descriptions of the following attributes: .SS "/usr/bin/ex" .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE CSI Enabled .TE .SS "\fB/usr/xpg4/bin/ex\fR" .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ CSI Enabled _ Interface Stability Standard .TE .SS "\fB/usr/xpg6/bin/ex\fR" .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ CSI Enabled _ Interface Stability Standard .TE .SH SEE ALSO .sp .LP \fBed\fR(1), \fBedit\fR(1), \fBgrep\fR(1), \fBsed\fR(1), \fBsort\fR(1), \fBvi\fR(1), \fBcurses\fR(3CURSES), \fBterm\fR(4), \fBterminfo\fR(4), \fBattributes\fR(5), \fBenviron\fR(5), \fBstandards\fR(5) .sp .LP \fISolaris Advanced User\&'s Guide\fR .SH AUTHOR .sp .LP The \fBvi\fR and \fBex\fR utilities are based on software developed by The University of California, Berkeley California, Computer Science Division, Department of Electrical Engineering and Computer Science. .SH NOTES .sp .LP Several options, although they continue to be supported, have been replaced in the documentation by options that follow the Command Syntax Standard (see \fBIntro\fR(1)). The \fB\(mi\fR option has been replaced by \fB-s\fR, a \fB-r\fR option that is not followed with an option-argument has been replaced by \fB-L\fR, and \fB+\fR\fBcommand\fR has been replaced by \fB-c\fR \fBcommand\fR. .sp .LP The message \fBfile too large to recover with \fR\fB-r\fR\fB option\fR, which is seen when a file is loaded, indicates that the file can be edited and saved successfully, but if the editing session is lost, recovery of the file with the \fB-r\fR option is not possible. .sp .LP The \fBz\fR command prints the number of logical rather than physical lines. More than a screen full of output can result if long lines are present. .sp .LP File input/output errors do not print a name if the command line \fB-s\fR option is used. .sp .LP The editing environment defaults to certain configuration options. When an editing session is initiated, \fBex\fR attempts to read the \fBEXINIT\fR environment variable. If it exists, the editor uses the values defined in \fBEXINIT\fR, otherwise the values set in \fB$HOME/.exrc\fR are used. If \fB$HOME/.exrc\fR does not exist, the default values are used. .sp .LP To use a copy of \fB\&.exrc\fR located in the current directory other than \fB$HOME\fR, set the \fIexrc\fR option in \fBEXINIT\fR or \fB$HOME/.exrc\fR. Options set in \fBEXINIT\fR can be turned off in a local \fB\&.exrc\fR only if \fIexrc\fR is set in \fBEXINIT\fR or \fB$HOME/.exrc\fR. In order to be used, \fI\&.exrc\fR in \fB$HOME\fR or the current directory must fulfill these conditions: .RS +4 .TP .ie t \(bu .el o It must exist. .RE .RS +4 .TP .ie t \(bu .el o It must be owned by the same userid as the real userid of the process, or the process has appropriate privileges. .RE .RS +4 .TP .ie t \(bu .el o It is not writable by anyone other than the owner. .RE .sp .LP There is no easy way to do a single scan ignoring case. .sp .LP The editor does not warn if text is placed in named buffers and not used before exiting the editor. .sp .LP Null characters are discarded in input files and cannot appear in resultant files.