nano/doc/nanorc.5

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.TH NANORC 5 "version 4.5" "October 2019"

.SH NAME
nanorc \- GNU nano's configuration file

.SH NOTICE
Starting with version 4.0, \fBnano\fR no longer hard-wraps an overlong
line by default.  It further uses smooth scrolling by default, and by
default includes the line below the title bar into the editing area.
.sp
If you want the old, Pico behavior back, you can use \fBset breaklonglines\fR,
\fBset jumpyscrolling\fR, and \fBset emptyline\fR.

.SH DESCRIPTION
The \fInanorc\fP file contains the default settings for \fBnano\fP, a
small and friendly editor.  The file should be in Unix format, not in
DOS or Mac format.  During startup, \fBnano\fP will first read the
system-wide settings, from \fI/etc/nanorc\fP (the exact path might be
different on your system), and then the user-specific settings, either
from \fI~/.nanorc\fR or from \fI$XDG_CONFIG_HOME/nano/nanorc\fR
or from \fI~/.config/nano/nanorc\fR, whichever is encountered first.

.SH OPTIONS
The configuration file accepts a series of \fBset\fP and \fBunset\fP
commands, which can be used to configure nano on startup without using
command-line options.  Additionally, there are some commands to define
syntax highlighting and to rebind keys -- see the two separate sections
on those.  \fBnano\fP reads one command per line.
.sp
Options in \fInanorc\fP files take precedence over nano's defaults, and
command-line options override \fInanorc\fP settings.  Also, options that
do not take an argument are unset by default.  So using the \fBunset\fR
command is only needed when wanting to override a setting of the system's
\fInanorc\fR file in your own \fInanorc\fR.  Options that take an
argument cannot be unset.
.sp
Quotes inside the \fIcharacters\fR  parameters below should not be escaped.
The last double quote on the line will be seen as the closing quote.
.sp
The supported commands and arguments are:

.TP 3
.B set afterends
Make Ctrl+Right stop at word ends instead of beginnings.
.TP
.B set allow_insecure_backup
When backing up files, allow the backup to succeed even if its permissions
can't be (re)set due to special OS considerations.  You should
NOT enable this option unless you are sure you need it.
.TP
.B set atblanks
When soft line wrapping is enabled, make it wrap lines at blank characters
(tabs and spaces) instead of always at the edge of the screen.
.TP
.B set autoindent
Automatically indent a newly created line to the same number of tabs
and/or spaces as the previous line (or as the next line if the previous
line is the beginning of a paragraph).
.TP
.B set backup
When saving a file, create a backup file by adding a tilde (\fB~\fP) to
the file's name.
.TP
.B set backupdir "\fIdirectory\fP"
Make and keep not just one backup file, but make and keep a uniquely
numbered one every time a file is saved -- when backups are enabled
with \fBset backup\fR or \fB\-\-backup\fR or \fB\-B\fR.
The uniquely numbered files are stored in the specified \fIdirectory\fR.
.TP
.B set boldtext
Use bold instead of reverse video for the title bar, status bar, key combos,
function tags, line numbers, and selected text.  This can be overridden by
setting the options \fBtitlecolor\fP, \fBstatuscolor\fP, \fBkeycolor\fP,
\fBfunctioncolor\fP, \fBnumbercolor\fP, and \fBselectedcolor\fP.
.TP
.BI "set brackets """ characters """
Set the characters treated as closing brackets when justifying
paragraphs.  This may not include blank characters.  Only closing
punctuation (see \fBset punct\fP), optionally followed by the specified
closing brackets, can end sentences.  The default value is "\fB"')>]}\fP".
.TP
.B set breaklonglines
Automatically hard-wrap the current line when it becomes overlong.
.TP
.B set casesensitive
Do case-sensitive searches by default.
.TP
.B set constantshow
Constantly display the cursor position in the status bar.
This overrides the option \fBquickblank\fR.
.TP
.B set cutfromcursor
Use cut-from-cursor-to-end-of-line by default, instead of cutting the whole line.
.TP
.B set emptyline
Do not use the line below the title bar, leaving it entirely blank.
.TP
.B set errorcolor \fIfgcolor\fR,\fIbgcolor\fR
Use this color combination for the status bar when an error message is displayed.
The default value is \fBbrightwhite,red\fR.
See \fBset titlecolor\fR for valid color names.
.TP
.B set fill \fInumber\fR
Set the target width for justifying and automatic hard-wrapping at this
\fInumber\fR of columns.  If the value is 0 or less, wrapping will occur
at the width of the screen minus \fInumber\fR columns, allowing the wrap
point to vary along with the width of the screen if the screen is resized.
The default value is \fB\-8\fR.
.TP
.B set functioncolor \fIfgcolor\fR,\fIbgcolor\fR
Specify the color combination to use for the function descriptions
in the two help lines at the bottom of the screen.
See \fBset titlecolor\fR for more details.
.TP
.B set guidestripe \fInumber
Draw a vertical stripe at the given column, to help judge the width of the
text.  (The color of the stripe can be changed with \fBset stripecolor\fR.)
.TP
.B set historylog
Save the last hundred search strings and replacement strings and
executed commands, so they can be easily reused in later sessions.
.TP
.B set jumpyscrolling
Scroll the buffer contents per half-screen instead of per line.
.TP
.B set keycolor \fIfgcolor\fR,\fIbgcolor\fR
Specify the color combination to use for the shortcut key combos
in the two help lines at the bottom of the screen.
See \fBset titlecolor\fR for more details.
.TP
.B set linenumbers
Display line numbers to the left of the text area.
.TP
.B set locking
Enable vim-style lock-files for when editing files.
.TP
.BI "set matchbrackets """ characters """
Set the opening and closing brackets that can be found by bracket
searches.  This may not include blank characters.  The opening set must
come before the closing set, and the two sets must be in the same order.
The default value is "\fB(<[{)>]}\fP".
.TP
.B set morespace
Deprecated option since it has become the default setting.
When needed, use \fBunset emptyline\fR instead.
.TP
.B set mouse
Enable mouse support, if available for your system.  When enabled, mouse
clicks can be used to place the cursor, set the mark (with a double
click), and execute shortcuts.  The mouse will work in the X Window
System, and on the console when gpm is running.  Text can still be
selected through dragging by holding down the Shift key.
.TP
.B set multibuffer
When reading in a file with ^R, insert it into a new buffer by default.
.TP
.B set noconvert
Don't convert files from DOS/Mac format.
.TP
.B set nohelp
Don't display the two help lines at the bottom of the screen.
.TP
.B set nonewlines
Don't automatically add a newline when a text does not end with one.
(This can cause you to save non-POSIX text files.)
.TP
.B set nopauses
Obsolete option.  Ignored.
.TP
.B set nowrap
Deprecated option since it has become the default setting.
When needed, use \fBunset breaklonglines\fR instead.
.TP
.B set numbercolor \fIfgcolor\fR,\fIbgcolor\fR
Specify the color combination to use for line numbers.
See \fBset titlecolor\fR for more details.
.TP
.B set operatingdir "\fIdirectory\fP"
\fBnano\fP will only read and write files inside \fIdirectory\fP and its
subdirectories.  Also, the current directory is changed to here, so
files are inserted from this directory.  By default, the operating
directory feature is turned off.
.TP
.B set positionlog
Save the cursor position of files between editing sessions.
The cursor position is remembered for the 200 most-recently edited files.
.TP
.B set preserve
Preserve the XON and XOFF keys (^Q and ^S).
.TP
.BI "set punct """ characters """
Set the characters treated as closing punctuation when justifying
paragraphs.  This may not include blank characters.  Only the
specfified closing punctuation, optionally followed by closing brackets
(see \fBbrackets\fP), can end sentences.  The default value is "\fB!.?\fP".
.TP
.B set quickblank
Do quick status-bar blanking: status-bar messages will disappear after 1
keystroke instead of 25.  The option \fBconstantshow\fR overrides this.
.TP
.BI "set quotestr """ regex """
Set the regular expression for matching the quoting part of a line.
The default value is "\fB^([\ \\t]*([!#%:;>|}]|//))+\fP".
(Note that \fB\\t\fR stands for an actual Tab character.)
This makes it possible to rejustify blocks of quoted text when composing
email, and to rewrap blocks of line comments when writing source code.
.TP
.B set rawsequences
Interpret escape sequences directly (instead of asking \fBncurses\fR to
translate them).  If you need this option to get your keyboard to work
properly, please report a bug.  Using this option disables \fBnano\fR's
mouse support.
.TP
.B set rebinddelete
Interpret the Delete and Backspace keys differently so that both Backspace
and Delete work properly.  You should only use this option when on your
system either Backspace acts like Delete or Delete acts like Backspace.
.TP
.B set regexp
Do regular-expression searches by default.
Regular expressions in \fBnano\fR are of the extended type (ERE).
.TP
.B set selectedcolor \fIfgcolor\fR,\fIbgcolor\fR
Specify the color combination to use for selected text.
See \fBset titlecolor\fR for more details.
.TP
.B set showcursor
Put the cursor on the highlighted item in the file browser, to aid
braille users.
.TP
.B set smarthome
Make the Home key smarter.  When Home is pressed anywhere but at the
very beginning of non-whitespace characters on a line, the cursor will
jump to that beginning (either forwards or backwards).  If the cursor is
already at that position, it will jump to the true beginning of the
line.
.TP
.B set smooth
Deprecated option since it has become the default setting.
When needed, use \fBunset jumpyscrolling\fR instead.
.TP
.B set softwrap
Enable soft line wrapping for easier viewing of very long lines.
.TP
.B set speller """\fIprogram\fR [\fIarg\fR...]\fB"""
Use the given \fIprogram\fR to do spell checking and correcting, instead of
using the built-in corrector that calls \fBhunspell\fR or GNU \fBspell\fR.
.TP
.B set statuscolor \fIfgcolor\fR,\fIbgcolor\fR
Specify the color combination to use for the status bar.
See \fBset titlecolor\fR for more details.
.TP
.B set stripecolor \fIfgcolor\fR,\fIbgcolor\fR
Specify the color combination to use for the vertical guiding stripe.
See \fBset titlecolor\fR for more details.
.TP
.B set suspend
Allow \fBnano\fP to be suspended.
.TP
.B set tabsize \fInumber\fR
Use a tab size of \fInumber\fR columns.  The value of \fInumber\fP must be
greater than 0.  The default value is \fB8\fR.
.TP
.B set tabstospaces
Convert typed tabs to spaces.
.TP
.B set tempfile
Save automatically on exit, don't prompt.
.TP
.B set titlecolor \fIfgcolor\fR,\fIbgcolor\fR
Specify the color combination to use for the title bar.
Valid names for the foreground and background colors are:
.BR white ", " black ", " blue ", " green ", " red ", "
.BR cyan ", " yellow ", " magenta ", and " normal
-- where \fBnormal\fR means the default foreground or background color.
The name of the foreground color may be prefixed with \fBbright\fR.
And either "\fIfgcolor\fR" or ",\fIbgcolor\fR" may be left out.
.TP
.B set trimblanks
Remove trailing whitespace from wrapped lines when automatic
hard-wrapping occurs or when text is justified.
.TP
.B set unix
Save a file by default in Unix format.  This overrides nano's
default behavior of saving a file in the format that it had.
(This option has no effect when you also use \fBset noconvert\fR.)
.TP
.B set view
Disallow file modification: read-only mode.
This mode allows the user to open also other files for viewing,
unless \fB\-\-restricted\fR is given on the command line.
.TP
.BI "set whitespace """ characters """
Set the two characters used to indicate the presence of tabs and
spaces.  They must be single-column characters.  The default pair
for a UTF-8 locale is "\fB\[Fc]\[md]\fR", and for other locales "\fB>.\fR".
.TP
.B set wordbounds
Detect word boundaries differently by treating punctuation
characters as parts of words.
.TP
.BI "set wordchars """ characters """
Specify which other characters (besides the normal alphanumeric ones)
should be considered as parts of words.  This overrides the option
\fBwordbounds\fR.
.TP
.B set zap
Let an unmodified Backspace or Delete erase the marked region
(instead of a single character, and without affecting the cutbuffer).

.SH SYNTAX HIGHLIGHTING
Coloring the different syntactic elements of a file
is done via regular expressions (see the \fBcolor\fR command below).
This is inherently imperfect, because regular expressions are not
powerful enough to fully parse a file.  Nevertheless, regular
expressions can do a lot and are easy to make, so they are a
good fit for a small editor like \fBnano\fR.
.sp
All regular expressions in \fBnano\fR are POSIX extended regular expressions.
This means that \fB.\fR, \fB?\fR, \fB*\fR, \fB+\fR, \fB^\fR, \fB$\fR, and
several other characters are special.
The period \fB.\fR matches any single character,
\fB?\fR means the preceding item is optional,
\fB*\fR means the preceding item may be matched zero or more times,
\fB+\fR means the preceding item must be matched one or more times,
\fB^\fR matches the beginning of a line, and \fB$\fR the end,
\fB\\<\fR matches the start of a word, and \fB\\>\fR the end,
and \fB\\s\fR matches a blank.
It also means that lookahead and lookbehind are not possible.
A complete explanation can be found in the manual page of GNU grep:
\fBman grep\fR.
.sp
For each kind of file a separate syntax can be defined
via the following commands:
.TP
.BI syntax " name \fR[" """" fileregex """ " \fR...]
Start the definition of a syntax with this \fIname\fR.
All subsequent \fBcolor\fR and other such commands
will be added to this syntax, until a new \fBsyntax\fR
command is encountered.

When \fBnano\fR is run, this syntax will be automatically
activated if the current filename matches the extended regular
expression \fIfileregex\fR.  Or the syntax can be explicitly
activated by using the \fB\-Y\fR or \fB\-\-syntax\fR
command-line option followed by the \fIname\fR.

The syntax \fBdefault\fP is special: it takes no \fIfileregex\fR,
and applies to files that don't match any syntax's regexes.
The syntax \fBnone\fP is reserved; specifying it on the command line
is the same as not having a syntax at all.
.TP
.BI "header """ regex """ \fR...
If from all defined syntaxes no \fIfileregex\fR matched, then compare
this \fIregex\fR (or regexes) against the first line of the current file,
to determine whether this syntax should be used for it.
.TP
.BI "magic """ regex """ \fR...
If no \fIfileregex\fR matched and no \fBheader\fR regex matched
either, then compare this \fIregex\fR (or regexes) against the
result of querying the \fBmagic\fP database about the current
file, to determine whether this syntax should be used for it.
(This functionality only works when \fBlibmagic\fP is installed on the
system and will be silently ignored otherwise.)
.TP
.BI formatter " program " \fR[ "arg " \fR...]
Run the given \fIprogram\fR on the full contents of the current buffer.
(The current buffer is written out to a temporary file, the program is
run on it, and then the temporary file is read back in, replacing the
contents of the buffer.)
.TP
.BI linter " program " \fR[ "arg " \fR...]
Use the given \fIprogram\fR to run a syntax check on the current buffer.
.TP
.BI "comment """ string """
Use the given \fIstring\fR for commenting and uncommenting lines.
If the string contains a vertical bar or pipe character (\fB|\fR),
this designates bracket-style comments; for example, "\fB/*|*/\fR" for
CSS files.  The characters before the pipe are prepended to the line and the
characters after the pipe are appended at the end of the line.  If no pipe
character is present, the full string is prepended; for example, "\fB#\fR"
for Python files.  If empty double quotes are specified, the comment/uncomment
function is disabled; for example, "" for JSON.
The default value is "\fB#\fP".
.TP
.BI "tabgives """ string """
Make the <Tab> key produce the given \fIstring\fR.  Useful for languages like
Python that want to see only spaces for indentation.
This overrides the setting of the \fBtabstospaces\fR option.
.TP
.BI "color " fgcolor , bgcolor " """ regex """ " \fR...
Paint all pieces of text that match the extended regular expression
\fIregex\fP with the given foreground and background colors, at least
one of which must be specified.  Valid color names are:
.BR white ", " black ", " blue ", " green ", " red ", "
.BR cyan ", " yellow ", " magenta ", and " normal
-- where \fBnormal\fR means the default foreground or background color.
You may use the prefix \fBbright\fR for the foreground color to get a
stronger highlight.  If your terminal supports transparency, not specifying
a \fIbgcolor\fP tells \fBnano\fP to attempt to use a transparent background.
.sp
All coloring commands are applied in the order in which they are specified,
which means that later commands can recolor stuff that was colored earlier.
.TP
.BI "icolor " fgcolor , bgcolor " """ regex """ " \fR...
Same as above, except that the matching is case insensitive.
.TP
.BI "color " fgcolor , bgcolor " start=""" fromrx """ end=""" torx """
Paint all pieces of text whose start matches extended regular expression
\fIfromrx\fP and whose end matches extended regular expression \fItorx\fP
with the given foreground and background colors,
at least one of which must be specified.  This means that, after an
initial instance of \fIfromrx\fP, all text until the first instance of
\fItorx\fP will be colored.  This allows syntax highlighting to span
multiple lines.
.TP
.BI "icolor " fgcolor , bgcolor " start=""" fromrx """ end=""" torx """
Same as above, except that the matching is case insensitive.
.TP
.BI "include """ syntaxfile """
Read in self-contained color syntaxes from \fIsyntaxfile\fP.  Note that
\fIsyntaxfile\fP may contain only the above commands, from \fBsyntax\fP
to \fBicolor\fP.
.TP
.BI extendsyntax " name command " \fR[ "arg " \fR...]
Extend the syntax previously defined as \fIname\fR with another
\fIcommand\fR.  This allows adding a new \fBcolor\fP, \fBicolor\fP,
\fBheader\fP, \fBmagic\fP, \fBcomment\fP, \fBlinter\fP, or \fBformatter\fR
command to an already defined syntax -- useful when you want to
slightly improve a syntax defined in one of the system-installed
files (which normally are not writable).

.SH REBINDING KEYS
Key bindings can be changed via the following three commands:
.RS 3
.TP
.BI bind " key function menu"
Rebinds the given \fIkey\fP to the given \fIfunction\fP in the given \fImenu\fP
(or in all menus where the function exists when \fBall\fP is used).
.TP
.BI bind " key " """" string """" " menu"
Makes the given \fIkey\fR produce the given \fIstring\fR in the given
\fImenu\fR (or in all menus where the key exists when \fBall\fR is used).
The \fIstring\fR can consist of text or commands or a mix of them.
(To enter a command into the \fIstring\fR, precede its keystroke
with \fBM\-V\fR.)
.TP
.BI unbind " key menu"
Unbinds the given \fIkey\fP from the given \fImenu\fP (or from all
menus where the key exists when \fBall\fP is used).
.RE

.TP
The format of \fIkey\fP should be one of:
.RS 3
.TP 5
.BI ^ X
where \fIX\fR is a Latin letter, or one of several ASCII characters
(@, ], \\, ^, _), or the word "Space".
Example: ^C.
.TP
.BI M\- X
where \fIX\fR is any ASCII character except [, or the word "Space".
Example: M\-C.
.TP
.BI F N
where \fIN\fR is a numeric value from 1 to 24.
Example: F10.
(Often, \fBF13\fR to \fBF24\fR can be typed as \fBF1\fR to \fBF12\fR with Shift.)

.TP
.BR Ins " or " Del .
.RE

Rebinding \fB^M\fR (Enter) or \fB^I\fR (Tab) is probably not a good idea.
On some terminals it's not possible to rebind \fB^H\fR (unless \fB\-\-raw\fR
is used) because its keycode is identical to that of the Backspace key.

.TP
Valid \fIfunction\fP names to be bound are:
.RS 3
.TP 2
.B help
Invokes the help viewer.
.TP
.B cancel
Cancels the current command.
.TP
.B exit
Exits from the program (or from the help viewer or the file browser).
.TP
.B writeout
Writes the current buffer to disk, asking for a name.
.TP
.B savefile
Writes the current file to disk without prompting.
.TP
.B insert
Inserts a file into the current buffer (at the current cursor position),
or into a new buffer when option \fBmultibuffer\fR is set.
.TP
.B whereis
Starts a forward search for text in the current buffer -- or for filenames
matching a string in the current list in the file browser.
.TP
.B wherewas
Starts a backward search for text in the current buffer -- or for filenames
matching a string in the current list in the file browser.
.TP
.B findprevious
Searches the next occurrence in the backward direction.
.TP
.B findnext
Searches the next occurrence in the forward direction.
.TP
.B replace
Interactively replaces text within the current buffer.
.TP
.B cut
Cuts and stores the current line (or the marked region).
.TP
.B copy
Copies the current line (or the marked region) without deleting it.
.TP
.B paste
Pastes the currently stored text into the current buffer at the
current cursor position.
.TP
.B zap
Throws away the current line (or the marked region).
(This function is bound by default to <Meta+Delete>.)
.TP
.B chopwordleft
Deletes from the cursor position to the beginning of the preceding word.
(This function is bound by default to <Shift+Ctrl+Delete>.  If your terminal
produces \fB^H\fR for <Ctrl+Backspace>, you can make <Ctrl+Backspace> delete
the word to the left of the cursor by rebinding ^H to this function.)
.TP
.B chopwordright
Deletes from the cursor position to the beginning of the next word.
(This function is bound by default to <Ctrl+Delete>.)
.TP
.B cutrestoffile
Cuts all text from the cursor position till the end of the buffer.
.TP
.B mark
Sets the mark at the current position, to start selecting text.
Or, when it is set, unsets the mark.
.TP
.B curpos
Shows the current cursor position: the line, column, and character positions.
.TP
.B wordcount
Counts the number of words, lines and characters in the current buffer.
.TP
.B speller
Invokes a spell-checking program, either the default \fBhunspell\fR or GNU
\fBspell\fR, or the one defined by \fB\-\-speller\fR or \fBset speller\fR.
.TP
.B formatter
Invokes a full-buffer-processing program (if the active syntax defines one).
.TP
.B linter
Invokes a syntax-checking program (if the active syntax defines one).
.TP
.B justify
Justifies the current paragraph.  A paragraph is a group of contiguous lines
that, apart from possibly the first line, all have the same indentation.  The
beginning of a paragraph is detected by either this lone line with a differing
indentation or by a preceding blank line.
.TP
.B fulljustify
Justifies the entire current buffer.
.TP
.B indent
Indents (shifts to the right) the currently marked text.
.TP
.B unindent
Unindents (shifts to the left) the currently marked text.
.TP
.B comment
Comments or uncomments the current line or marked lines, using the comment
style specified in the active syntax.
.TP
.B complete
Completes the fragment before the cursor to a full word found elsewhere
in the current buffer.
.TP
.B left
Goes left one position (in the editor or browser).
.TP
.B right
Goes right one position (in the editor or browser).
.TP
.B up
Goes one line up (in the editor or browser).
.TP
.B down
Goes one line down (in the editor or browser).
.TP
.B scrollup
Scrolls the viewport up one row (meaning that the text slides down)
while keeping the cursor in the same text position, if possible.
.TP
.B scrolldown
Scrolls the viewport down one row (meaning that the text slides up)
while keeping the cursor in the same text position, if possible.
.TP
.B prevword
Moves the cursor to the beginning of the previous word.
.TP
.B nextword
Moves the cursor to the beginning of the next word.
.TP
.B home
Moves the cursor to the beginning of the current line.
.TP
.B end
Moves the cursor to the end of the current line.
.TP
.B beginpara
Moves the cursor to the beginning of the current paragraph.
.TP
.B endpara
Moves the cursor to the end of the current paragraph.
.TP
.B prevblock
Moves the cursor to the beginning of the current or preceding block of text.
(Blocks are separated by one or more blank lines.)
.TP
.B nextblock
Moves the cursor to the beginning of the next block of text.
.TP
.B pageup
Goes up one screenful.
.TP
.B pagedown
Goes down one screenful.
.TP
.B firstline
Goes to the first line of the file.
.TP
.B lastline
Goes to the last line of the file.
.TP
.B gotoline
Goes to a specific line (and column if specified).  Negative numbers count
from the end of the file (and end of the line).
.TP
.B findbracket
Moves the cursor to the bracket (brace, parenthesis, etc.) that matches
(pairs) with the one under the cursor.
.TP
.B prevbuf
Switches to editing/viewing the previous buffer when multiple buffers are open.
.TP
.B nextbuf
Switches to editing/viewing the next buffer when multiple buffers are open.
.TP
.B verbatim
Inserts the next keystroke verbatim into the file.
.TP
.B tab
Inserts a tab at the current cursor location.
.TP
.B enter
Inserts a new line below the current one.
.TP
.B delete
Deletes the character under the cursor.
.TP
.B backspace
Deletes the character before the cursor.
.TP
.B recordmacro
Starts the recording of keystrokes -- the keystrokes are stored
as a macro.  When already recording, the recording is stopped.
.TP
.B runmacro
Replays the keystrokes of the last recorded macro.
.TP
.B undo
Undoes the last performed text action (add text, delete text, etc).
.TP
.B redo
Redoes the last undone action (i.e., it undoes an undo).
.TP
.B refresh
Refreshes the screen.
.TP
.B suspend
Suspends the editor (if the suspending function is enabled, see the
"suspendenable" entry below).
.TP
.B casesens
Toggles whether searching/replacing ignores or respects the case of
the given characters.
.TP
.B regexp
Toggles whether searching/replacing uses literal strings or regular expressions.
.TP
.B backwards
Toggles whether searching/replacing goes forward or backward.
.TP
.B older
Retrieves the previous (earlier) entry at a prompt.
.TP
.B newer
Retrieves the next (later) entry at a prompt.
.TP
.B flipreplace
Toggles between searching for something and replacing something.
.TP
.B flipgoto
Toggles between searching for text and targeting a line number.
.TP
.B flipexecute
Toggles between inserting a file and executing a command.
.TP
.B flippipe
When executing a command, toggles whether the current buffer (or marked
region) is piped to the command.
.TP
.B flipnewbuffer
Toggles between inserting into the current buffer and into a new
empty buffer.
.TP
.B flipconvert
When reading in a file, toggles between converting and not converting
it from DOS/Mac format.  Converting is the default.
.TP
.B dosformat
When writing a file, switches to writing a DOS format (CR/LF).
.TP
.B macformat
When writing a file, switches to writing a Mac format.
.TP
.B append
When writing a file, appends to the end instead of overwriting.
.TP
.B prepend
When writing a file, 'prepends' (writes at the beginning) instead of overwriting.
.TP
.B backup
When writing a file, creates a backup of the current file.
.TP
.B discardbuffer
When about to write a file, discard the current buffer without saving.
(This function is bound by default only when option \fB\-\-tempfile\fR
is in effect.)
.TP
.B browser
Starts the file browser, allowing to select a file from a list.
.TP
.B gotodir
Goes to a directory to be specified, allowing to browse anywhere
in the filesystem.
.TP
.B firstfile
Goes to the first file when using the file browser (reading or writing files).
.TP
.B lastfile
Goes to the last file when using the file browser (reading or writing files).
.TP
.B nohelp
Toggles the presence of the two-line list of key bindings at the bottom of the screen.
.TP
.B constantshow
Toggles the constant display of the current line, column, and character positions.
.TP
.B softwrap
Toggles the displaying of overlong lines on multiple screen lines.
.TP
.B linenumbers
Toggles the display of line numbers in front of the text.
.TP
.B whitespacedisplay
Toggles the showing of whitespace.
.TP
.B nosyntax
Toggles syntax highlighting.
.TP
.B smarthome
Toggles the smartness of the Home key.
.TP
.B autoindent
Toggles whether a newly created line will contain the same amount of leading
whitespace as the preceding line -- or as the next line if the preceding line
is the beginning of a paragraph.
.TP
.B cutfromcursor
Toggles whether cutting text will cut the whole line or just from the current cursor
position to the end of the line.
.TP
.B nowrap
Toggles whether long lines will be hard-wrapped to the next line.
.TP
.B tabstospaces
Toggles whether typed tabs will be converted to spaces.
.TP
.B mouse
Toggles mouse support.
.TP
.B suspendenable
Toggles whether the suspend sequence (normally ^Z) will suspend the editor window.
.RE

.TP
Valid \fImenu\fP sections are:
.RS 3
.TP 2
.B main
The main editor window where text is entered and edited.
.TP
.B search
The search menu (AKA whereis).
.TP
.B replace
The 'search to replace' menu.
.TP
.B replacewith
The 'replace with' menu, which comes up after 'search to replace'.
.TP
.B yesno
The 'yesno' menu, where the Yes/No/All/Cancel question is asked.
.TP
.B gotoline
The 'goto line (and column)' menu.
.TP
.B writeout
The 'write file' menu.
.TP
.B insert
The 'insert file' menu.
.TP
.B extcmd
The menu for inserting output from an external command, reached from the insert menu.
.TP
.B help
The help-viewer menu.
.TP
.B spell
The menu of the integrated spell checker where the user can edit a misspelled word.
.TP
.B linter
The linter menu.
.TP
.B browser
The file browser for inserting or writing a file.
.TP
.B whereisfile
The 'search for a file' menu in the file browser.
.TP
.B gotodir
The 'go to directory' menu in the file browser.
.TP
.B all
A special name that encompasses all menus.
For \fBbind\fR it means all menus where the specified \fIfunction\fR exists;
for \fBunbind\fR it means all menus where the specified \fIkey\fR exists.
.RE

.SH FILES
.TP
.I /etc/nanorc
System-wide configuration file.
.TP
.IR ~/.nanorc " or " $XDG_CONFIG_HOME/nano/nanorc " or " ~/.config/nano/nanorc
Per-user configuration file.

.SH SEE ALSO
.BR nano (1)