Concept Index

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Index EntrySection

-
-debug-init’ optionDebugging a customization file

.
., equivalent to vi commandRepeating commands
.emacs file, setting upSetting up a customization file
.emacs.d/init.el debuggingDebugging a customization file
.emacs.d/init.el file, errors inErrors with init files
.emacs.d/init.el file, setting upSetting up a customization file
.XdefaultsEmacs ignores X resources

/
/var/spool/mail and RmailRmail writes to /var/spool/mail

#
#ifdef, selective display ofHiding #ifdef lines

$
$’ in file namesEditing files with $ in the name

2
24-bit direct color modeColors on a TTY

A
Abbrevs, turning on by defaultTurning on abbrevs by default
Acronyms, definitions forCommon acronyms
add fonts for use with EmacsHow to add fonts
Adding to load-pathChanging load-path
Alternate character setsAlternate character sets
Alternative Info file viewersViewing Info files outside of Emacs
Anti-aliased fontsNew in Emacs 23
Antivirus programs, and Shell ModeProblems with Shell Mode
Apple computers, Emacs forEmacs for other operating systems
AproposLearning how to do something
ArabicRight-to-left alphabets
Archived postings from help-gnu-emacsMailing list archives
Arrow keys, symbols generated byWorking with function and arrow keys
AspellSpell-checkers
Associating modes with filesAssociating modes with files
auto-fill-mode, activating automaticallyTurning on auto-fill by default
auto-fill-mode, introduction toWrapping words automatically
auto-mode-alist, modifyingAssociating modes with files
Auto-savingDisabling auto-save-mode
automatic display of Lisp APIsNew in Emacs 25
Automatic entry to auto-fill-modeTurning on auto-fill by default
Automatic filing of outgoing mailSaving a copy of outgoing mail

B
Backspace key invokes helpBackspace invokes help
Backup files in a single directoryDisabling backups
Backups, disablingDisabling backups
Basic editing with EmacsBasic editing
Basic keysBasic keys
Beeping, turning offTurning off beeping
Beginning editingBasic editing
Bell, visibleTurning off beeping
Bell, volume ofTurning the volume down
bidirectional displayNew in Emacs 24
bidirectional editingNew in Emacs 25
bidirectional scriptsRight-to-left alphabets
bignum supportNew in Emacs 27
Binding keys to commandsBinding keys to commands
Binding modifiers and function keysBinding combinations of modifiers and function keys
bracketed paste modeNew in Emacs 25
Bug reportingReporting bugs
Bugs and problemsBugs and problems
Building Emacs from sourceInstalling Emacs

C
C-h, definition ofBasic keys
C-M-h, definition ofBasic keys
Case sensitivity in replacementsControlling case sensitivity
Case sensitivity of searchesControlling case sensitivity
case-fold-searchControlling case sensitivity
case-replaceControlling case sensitivity
Catching up all newsgroups in GnusCatching up in all newsgroups
character folding in searchesNew in Emacs 25
Character setsNew in Emacs 23
Checking spellingSpell-checkers
Colorizing textTurning on syntax highlighting
Colors on a TTYColors on a TTY
Colors on text-only terminalsNew in Emacs 21
Column, displaying the currentDisplaying the current line or column
Command description in the manualLearning how to do something
Commands, binding keys toBinding keys to commands
Commands, extendedExtended commands
Commands, repeating many timesRepeating commands
Common acronyms, definitions forCommon acronyms
Common requestsCommon requests
Compilation error messagesGoing to a line by number
Compiler error messages, recognizingCompiler error messages
Compiling and installing EmacsCompiling and installing Emacs
Compiling Emacs for DOSEmacs for other operating systems
Compose Character key, using as MetaCompose Character
Console, colorsColors on a TTY
Console, Linux console, TTY, fbtermEmacs in a Linux console
Contracting the FSFContacting the FSF
Control characters, generatingProducing C-XXX with the keyboard
Control characters, working withWorking with unprintable characters
Control key, notation forBasic keys
Control-Meta characters, notation forBasic keys
Conventions for file namesFile-name conventions
Copying outgoing mail to a fileSaving a copy of outgoing mail
COPYING, description of fileInformational files for Emacs
Creating new menu optionsModifying pull-down menus
Crosspostings make Gnus catching up slowMaking Gnus faster
Current directory and shell-modeShell mode loses the current directory
Current GNU distributionsCurrent GNU distributions
Customization file, setting upSetting up a customization file
Customize groupsUsing Customize
Customize indentationCustomizing C and C++ indentation
Customizing facesUsing Customize
Customizing variablesUsing Customize

D
Daemon modeNew in Emacs 23
Debugging .emacs.d/init.el fileDebugging a customization file
Debugging init fileDebugging a customization file
Debugging init fileErrors with init files
Decoration level, in font-lock-modeTurning on syntax highlighting
DEL key does not deleteBackspace invokes help
DEL, definition ofBasic keys
delete-selection-modeReplacing highlighted text
Deleting menus and menu optionsDeleting menus and menu options
Development, EmacsLatest version of Emacs
Differences between Emacs 19 and Emacs 20New in Emacs 20
Differences between Emacs 20 and Emacs 21New in Emacs 21
Differences between Emacs 21 and Emacs 22New in Emacs 22
Differences between Emacs 22 and Emacs 23New in Emacs 23
Differences between Emacs 23 and Emacs 24New in Emacs 24
Differences between Emacs 24 and Emacs 25New in Emacs 25
Differences between Emacs 25 and Emacs 26New in Emacs 26
Differences between Emacs 26 and Emacs 27New in Emacs 27
Differences between Emacs 27 and Emacs 28New in Emacs 28
Differences between Emacs 28 and Emacs 29New in Emacs 29
Differences between Unix and Emacs regexpsUsing regular expressions
direct color in terminalsColors on a TTY
Directories and files that come with EmacsFile-name conventions
Directory-local variablesNew in Emacs 23
Directory, current in shell-modeShell mode loses the current directory
Dired does not see a fileDired claims that no file is on this line
Disabling auto-save-modeDisabling auto-save-mode
Disabling backupsDisabling backups
Displaying eight-bit charactersEmacs does not display 8-bit characters
Displaying the current line or columnDisplaying the current line or column
DISTRIB, description of fileInformational files for Emacs
DocumentationNew in Emacs 22
Documentation for etagsDocumentation for etags
Documentation on Emacs LispEmacs Lisp documentation
Documentation, installing new Texinfo filesInstalling Texinfo documentation
DOS, Emacs forEmacs for other operating systems
double-bufferingNew in Emacs 26
Downloading and installing EmacsInstalling Emacs
Downloading EmacsDownloading Emacs
Drag-and-dropNew in Emacs 22

E
early init fileNew in Emacs 27
Echoed commands in shell-mode^M in the shell buffer
Editing files with ‘$’ in the nameEditing files with $ in the name
Editing MS-DOS filesEditing MS-DOS files
Eight-bit characters, displayingEmacs does not display 8-bit characters
Eight-bit characters, enteringInputting eight-bit characters
Eight-bit characters, working withWorking with unprintable characters
Emacs 20, new features inNew in Emacs 20
Emacs 21, new features inNew in Emacs 21
Emacs 22, new features inNew in Emacs 22
Emacs 23, new features inNew in Emacs 23
Emacs 24, new features inNew in Emacs 24
Emacs 25, new features inNew in Emacs 25
Emacs 26, new features inNew in Emacs 26
Emacs 27, new features inNew in Emacs 27
Emacs 28, new features inNew in Emacs 28
Emacs 29, new features inNew in Emacs 29
Emacs entries for termcap/terminfoTermcap/Terminfo entries for Emacs
Emacs for MS-DOSEmacs for other operating systems
Emacs for MS-WindowsEmacs for other operating systems
Emacs Lisp ArchivePackages that do not come with Emacs
Emacs Lisp ManualNew in Emacs 22
Emacs Lisp Reference ManualEmacs Lisp documentation
Emacs manual, obtaining a printed or HTML copy ofGetting a printed manual
Emacs manual, reading topics inEmacs manual
Emacs name originOrigin of the term Emacs
Emacs server functionsUsing an already running Emacs process
emacsclientUsing an already running Emacs process
EnchantSpell-checkers
Enchant supportNew in Emacs 26
Entering eight-bit charactersInputting eight-bit characters
Error in .emacs.d/init.elErrors with init files
Error in init fileErrors with init files
Errors when building EmacsProblems building Emacs
Errors, recognizing compilerCompiler error messages
ESC, definition ofBasic keys
Escape key, lackingNo Escape key
Escape sequences in ls outputEscape sequences in shell output
etags, documentation forDocumentation for etags
Evaluating Lisp codeEvaluating Emacs Lisp code
ewwNew in Emacs 25
Expanding aliases when sending mailExpanding aliases when sending mail
explicit-shell-file-nameProblems with Shell Mode
Extended commandsExtended commands

F
FAQ for Emacs on MS-WindowsEmacs for other operating systems
FAQ for GnusReading news with Emacs
FAQ notationFAQ notation
FAQ, font-lock-modeTurning on syntax highlighting
FAQ, obtaining theObtaining the FAQ
FarsiRight-to-left alphabets
Faster, starting GnusMaking Gnus faster
File extensions and modesAssociating modes with files
File name, displaying in the titlebarDisplaying the current file name in the titlebar
File names containing ‘$’, editingEditing files with $ in the name
file-local-variable and securitySecurity risks with Emacs
File-name conventionsFile-name conventions
Files included with EmacsInformational files for Emacs
Files, maximum sizeProblems with very large files
Files, replacing strings across multipleReplacing text across multiple files
Filing outgoing mailSaving a copy of outgoing mail
Fill prefixAutomatic indentation
fill-column, default valueWrapping words automatically
Filling automaticallyTurning on auto-fill by default
Finding an Emacs Lisp packageFinding a package with particular functionality
Finding commands and variablesLearning how to do something
Finding current GNU softwareCurrent GNU distributions
Finding Emacs and related packagesFinding Emacs and related packages
Finding other packagesPackages that do not come with Emacs
Finding topics in the Emacs manualEmacs manual
Folder, sorting messages in an RmailSorting the messages in an Rmail folder
font-lock-modeTurning on syntax highlighting
Frame parametersEmacs ignores frame parameters
frame-title-formatDisplaying the current file name in the titlebar
Free Software Foundation, contactingContacting the FSF
Freetype fontsNew in Emacs 23
FSF, definition ofCommon acronyms
Fullscreen modeFullscreen mode on MS-Windows
Function documentationEmacs Lisp documentation
Function keys and modifiersBinding combinations of modifiers and function keys
Function keys, symbols generated byWorking with function and arrow keys
Functionality, finding a particular packageFinding a package with particular functionality

G
General questionsGeneral questions
Generating control charactersProducing C-XXX with the keyboard
Getting helpGetting help
GNU mailing listsGuidelines for mailing list postings
GNU, definition ofCommon acronyms
Gnus FAQReading news with Emacs
Gnus is slow when catching upMaking Gnus faster
Gnus newsreaderReading news with Emacs
Gnus, Catching up all newsgroups inCatching up in all newsgroups
Gnus, starting fasterMaking Gnus faster
GNUstep portNew in Emacs 23
GNUstep, Emacs forEmacs for other operating systems
Going to a line by numberGoing to a line by number
Good bug reportsReporting bugs
GPL, definition ofCommon acronyms
GTK+ ToolkitNew in Emacs 22

H
HarfBuzzNew in Emacs 27
Hebrew, handling with EmacsRight-to-left alphabets
Help for EmacsLearning how to do something
Help installing EmacsHelp installing Emacs
Help invoked by BackspaceBackspace invokes help
Help system, entering theBasic editing
hide-ifdef-modeHiding #ifdef lines
hide-ifdef, C/C++ expressions in macrosNew in Emacs 25
Hiding #ifdef textHiding #ifdef lines
Highlighting and replacing textReplacing highlighted text
Highlighting based on syntaxTurning on syntax highlighting
Highlighting matching parenthesesMatching parentheses
History of EmacsHistory of Emacs
horizontal scroll barsNew in Emacs 25
horizontal scrolling of current lineNew in Emacs 26
How to submit a bug reportReporting bugs
HunspellSpell-checkers

I
Iconification under the X Window SystemForcing Emacs to iconify itself
Ignored X resourcesEmacs ignores X resources
Ignoring case in searchesControlling case sensitivity
Included text prefix, changingChanging the included text prefix
Indentation, how to customizeCustomizing C and C++ indentation
Indenting new linesAutomatic indentation
Indenting of switchIndenting switch statements
Index search in a manualLearning how to do something
Info file viewersViewing Info files outside of Emacs
Info files, how to installInstalling Texinfo documentation
Info, finding topics inEmacs manual
Informational files included with EmacsInformational files for Emacs
Init file debuggingDebugging a customization file
Init file, errors inErrors with init files
Init file, locatingSetting up a customization file
Init file, setting upSetting up a customization file
Input, 8-bit charactersInputting eight-bit characters
InsertOverwrite mode
Installation helpHelp installing Emacs
Installing EmacsInstalling Emacs
Installing Texinfo documentationInstalling Texinfo documentation
intlfontsHow to add fonts
Invalid prefix charactersInvalid prefix characters
isearch yankingYanking text in isearch
IspellSpell-checkers

J
JSON, native parsingNew in Emacs 27
Just-In-Time syntax highlightingTurning on syntax highlighting

K
Key bindingsKey bindings
Key translations under XX key translations for Emacs
keyboard-translateSwapping keys
Keymaps and menusModifying pull-down menus
Keys, binding to commandsBinding keys to commands
Keys, swappingSwapping keys

L
Lacking an Escape keyNo Escape key
Large files, openingProblems with very large files
Latest FAQ version, obtaining theObtaining the FAQ
Latest version of EmacsLatest version of Emacs
Learning more about GnusReading news with Emacs
Learning to do something in EmacsLearning how to do something
Length of tab characterChanging the length of a Tab
Levels of syntax highlightingTurning on syntax highlighting
lexical bindingNew in Emacs 24
LFD, definition ofBasic keys
line number displayNew in Emacs 26
Line number, displaying the currentDisplaying the current line or column
Line wrapWrapping words automatically
line-number-modeDisplaying the current line or column
Lisp forms, evaluatingEvaluating Emacs Lisp code
Lisp packages that do not come with EmacsPackages that do not come with Emacs
load-path, modifyingChanging load-path
loadable modulesNew in Emacs 25
Lookup a subject in a manualLearning how to do something
ls in Shell modeEscape sequences in shell output

M
M-x, meaning ofExtended commands
MACHINES, description of fileInformational files for Emacs
Macintosh, Emacs forEmacs for other operating systems
macOS CocoaNew in Emacs 23
macOS, Emacs forEmacs for other operating systems
Mail alias expansionExpanding aliases when sending mail
Mail and newsMail and news
Mail reader, starting automaticallyAutomatically starting a mail or news reader
Mail replies, inserting a prefix characterInserting text at the beginning of each line
mail-yank-prefixInserting text at the beginning of each line
Mail, saving outgoing automaticallySaving a copy of outgoing mail
Mailing list archives for GNU listsMailing list archives
Mailing lists, appropriate messages forGuidelines for mailing list postings
Major mode for shell scriptsAssociating modes with files
Manual, obtaining a printed or HTML copy ofGetting a printed manual
Matching parenthesesMatching parentheses
Maximize frameFullscreen mode on MS-Windows
Maximum file sizeProblems with very large files
Maximum line width, default valueWrapping words automatically
Menus and keymapsModifying pull-down menus
Menus, creating or modifyingModifying pull-down menus
Menus, deletingDeleting menus and menu options
Meta key and xtermMeta key does not work in xterm
Meta key, notation forBasic keys
Meta key, what to do if you lack itNo Meta key
Meta, using Compose Character forCompose Character
Microsoft files, editingEditing MS-DOS files
Microsoft Windows, Emacs forEmacs for other operating systems
Misspecified key sequencesInvalid prefix characters
mode-line-formatDisplaying the current line or column
Modes, associating with file extensionsAssociating modes with files
Modifiers and function keysBinding combinations of modifiers and function keys
Modifying load-pathChanging load-path
Modifying pull-down menusModifying pull-down menus
Mouse wheelNew in Emacs 22
movemail’ and securitySecurity risks with Emacs
MS-DOS files, editingEditing MS-DOS files
MS-DOS, Emacs forEmacs for other operating systems
Multi-tty supportNew in Emacs 23
Multilingual EnvironmentNew in Emacs 22
Multiple files, replacing acrossReplacing text across multiple files

N
native compilation of Lisp filesNew in Emacs 28
New lines, indenting ofAutomatic indentation
New modesNew in Emacs 22
New Texinfo files, installingInstalling Texinfo documentation
News reader, starting automaticallyAutomatically starting a mail or news reader
News replies, inserting a prefix characterInserting text at the beginning of each line
NEWS, description of fileInformational files for Emacs
newsgroupsGuidelines for mailing list postings
NeXTstep portNew in Emacs 23
No Escape keyNo Escape key
No Meta keyNo Meta key
Not enough disk space to install EmacsEmacs for minimalists
Notation for keysBasic keys

O
Official GNU software sitesCurrent GNU distributions
Old mailing list posts for GNU listsMailing list archives
Old Usenet postings for GNU groupsMailing list archives
One space following periodsFilling paragraphs with a single space
Opening very large filesProblems with very large files
Ordering GNU softwareContacting the FSF
Origin of the term “Emacs”Origin of the term Emacs
Original version of EmacsOrigin of the term Emacs
Overview of help systemsLearning how to do something
overwrite-modeOverwrite mode
Overwriting existing textOverwrite mode

P
Package, findingFinding a package with particular functionality
packages, installing moreNew in Emacs 24
Packages, those that do not come with EmacsPackages that do not come with Emacs
Pairs of parentheses, highlightingMatching parentheses
paren.elMatching parentheses
Parentheses, matchingMatching parentheses
pasting text on text terminalsNew in Emacs 25
Periods, one space followingFilling paragraphs with a single space
picture-modeForcing the cursor to remain in the same column
portable dumperNew in Emacs 27
Posting messages to mailing listsGuidelines for mailing list postings
Prefix character, inserting in mail/news repliesInserting text at the beginning of each line
Prefix characters, invalidInvalid prefix characters
Prefix in mail/news followups, changingChanging the included text prefix
Prefixing a region with some textInserting text at the beginning of each line
Prefixing linesAutomatic indentation
Previous line, indenting according toAutomatic indentation
Printed Emacs manual, obtainingGetting a printed manual
Printing a Texinfo filePrinting a Texinfo file
Printing documentationPrinting a Texinfo file
Problems building EmacsProblems building Emacs
Producing control charactersProducing C-XXX with the keyboard
projectNew in Emacs 25
Pull-down menus, creating or modifyingModifying pull-down menus

Q
Quoting in mail messagesChanging the included text prefix

R
Reading news under EmacsReading news with Emacs
Reading the Emacs manualLearning how to do something
Reading topics in the Emacs manualEmacs manual
Recognizing non-standard compiler errorsCompiler error messages
RecompilationGoing to a line by number
Recursive search/replace operationsReplacing text across multiple files
Reducing the increment when scrollingScrolling only one line
Reference card for EmacsLearning how to do something
Reference cards, in other languagesLearning how to do something
Reference manual for Emacs LispEmacs Lisp documentation
RegexpsUsing regular expressions
Regexps and unprintable charactersWorking with unprintable characters
Regexps for recognizing compiler errorsCompiler error messages
Regular expressionsUsing regular expressions
Remaining in the same column, regardless of contentsForcing the cursor to remain in the same column
Removing yourself from GNU mailing listsUnsubscribing from Emacs lists
Repeating commands many timesRepeating commands
Replacing highlighted textReplacing highlighted text
Replacing newlinesSearching for/replacing newlines
Replacing strings across filesReplacing text across multiple files
Replacing, and case sensitivityControlling case sensitivity
Replies to mail/news, inserting a prefix characterInserting text at the beginning of each line
Replying only to the sender of a messageReplying to the sender of a message
Reporting bugsReporting bugs
Repository, EmacsLatest version of Emacs
Resources, XValid X resources
RET, definition ofBasic keys
Richard Stallman, acronym forCommon acronyms
Right-to-left alphabetsRight-to-left alphabets
right-to-left languagesNew in Emacs 24
Rmail and /var/spool/mailRmail writes to /var/spool/mail
rmail, and HTML mailsNew in Emacs 25
Rmail, replying to the sender of a message inReplying to the sender of a message
Rmail, sorting messages inSorting the messages in an Rmail folder
RMS, definition ofCommon acronyms

S
Saving a copy of outgoing mailSaving a copy of outgoing mail
Saving at frequent intervalsDisabling auto-save-mode
Scrolling only one lineScrolling only one line
Searching for newlinesSearching for/replacing newlines
Searching for unprintable charactersWorking with unprintable characters
Searching without case sensitivityControlling case sensitivity
Security with EmacsSecurity risks with Emacs
Selectively displaying #ifdef codeHiding #ifdef lines
Self-paced tutorial, invoking theBasic editing
Semitic alphabetsRight-to-left alphabets
Sender, replying only toReplying to the sender of a message
Sending mail with aliasesExpanding aliases when sending mail
Set number capability in vi emulatorsDisplaying the current line or column
Setting the included text characterChanging the included text prefix
Setting X resourcesValid X resources
Shell buffer, echoed commands and ‘^M’ in^M in the shell buffer
Shell Mode, problemsProblems with Shell Mode
shell-mode and current directoryShell mode loses the current directory
Show matching paren as in viMatching parentheses
Single space following periodsFilling paragraphs with a single space
Slow catch up in GnusMaking Gnus faster
Sorting messages in an Rmail folderSorting the messages in an Rmail folder
Source code, building Emacs fromInstalling Emacs
Sources for current GNU distributionsCurrent GNU distributions
SPC, definition ofBasic keys
Spell-checkerSpell-checkers
Stallman, Richard, acronym forCommon acronyms
Starting Gnus fasterMaking Gnus faster
Starting mail/news reader automaticallyAutomatically starting a mail or news reader
Stuff, current GNUCurrent GNU distributions
support for push commands in VCNew in Emacs 25
Supported systemsNew in Emacs 22
Suspending EmacsForcing Emacs to iconify itself
Swapping keysSwapping keys
switch, indentingIndenting switch statements
Symbols generated by function keysWorking with function and arrow keys
Syntax highlightingTurning on syntax highlighting
Syntax highlighting on a TTYColors on a TTY
Synthetic X events and securitySecurity risks with Emacs
systemd supportNew in Emacs 26

T
Tab lengthChanging the length of a Tab
TAB, definition ofBasic keys
tabsNew in Emacs 27
TECOOrigin of the term Emacs
TermcapTermcap/Terminfo entries for Emacs
Terminal setup code in init fileTerminal setup code works after Emacs has begun
TerminfoTermcap/Terminfo entries for Emacs
Texinfo documentation, installingInstalling Texinfo documentation
Texinfo file, printingPrinting a Texinfo file
Text indentationAutomatic indentation
Text strings, putting regexps inUsing regular expressions
themesNew in Emacs 24
threadsNew in Emacs 26
Titlebar, displaying the current file name inDisplaying the current file name in the titlebar
Toggling overwrite-modeOverwrite mode
Toolbar supportNew in Emacs 21
Translations for keys under XX key translations for Emacs
TTY colorsNew in Emacs 21
Tutorial, invoking theBasic editing

U
Unbundled packagesPackages that do not come with Emacs
UnicodeNew in Emacs 23
Unicode 11.0.0New in Emacs 26
Unicode 9.0.0New in Emacs 25
Unicode characters, typing easilyNew in Emacs 25
Unix regexps, differences from EmacsUsing regular expressions
Unix systems, installing Emacs onInstalling Emacs
Unprintable characters, working withWorking with unprintable characters
Unsubscribing from GNU mailing listsUnsubscribing from Emacs lists
Up-to-date GNU stuffCurrent GNU distributions
Usenet archives for GNU groupsMailing list archives
Usenet reader in EmacsReading news with Emacs
Using an existing Emacs processUsing an already running Emacs process

V
Variable documentationEmacs Lisp documentation
Variable-size fontsNew in Emacs 21
Version, latestLatest version of Emacs
Vertical movement in empty documentsForcing the cursor to remain in the same column
Very large files, openingProblems with very large files
Viewing Info filesViewing Info files outside of Emacs
Visible bellTurning off beeping
Volume of bellTurning the volume down

W
Why Emacs?Origin of the term Emacs
Windows files, editingEditing MS-DOS files
Working with arrow keysWorking with function and arrow keys
Working with function keysWorking with function and arrow keys
Working with unprintable charactersWorking with unprintable characters
Wrapping linesWrapping words automatically
Wrapping word automaticallyWrapping words automatically
Writing all auxiliary files to the same directoryNot writing files to the current directory

X
X and tty displaysNew in Emacs 23
X events and securitySecurity risks with Emacs
X key translationsX key translations for Emacs
X resourcesValid X resources
X resources being ignoredEmacs ignores X resources
X Window System and iconificationForcing Emacs to iconify itself
XDG conventionNew in Emacs 27
XEmacsWhat was XEmacs?
xrefNew in Emacs 25
Xterm and Meta keyMeta key does not work in xterm
xwidgetsNew in Emacs 25

Y
Yanking text into the search stringYanking text in isearch

Z
ZileEmacs for minimalists