Provided by: nano_4.8-1ubuntu1_amd64
nano - Nano's ANOther editor, inspired by Pico
nano [options] [[+line[,column]] file]... nano [options] [[+[crCR](/|?)string] file]...
Since version 4.0, nano by default: · does not automatically hard-wrap lines that become overlong, · includes the line below the title bar in the editing area, · does linewise (smooth) scrolling. If you want the old, Pico behavior back, you can use --breaklonglines, --emptyline, and --jumpyscrolling (or -bej for short).
nano is a small and friendly editor. It copies the look and feel of Pico, but is free software, and implements several features that Pico lacks, such as: opening multiple files, scrolling per line, undo/redo, syntax coloring, line numbering, and soft-wrapping overlong lines. When giving a filename on the command line, the cursor can be put on a specific line by adding the line number with a plus sign (+) before the filename, and even in a specific column by adding it with a comma. (Negative numbers count from the end of the file or line.) The cursor can be put on the first or last occurrence of a specific string by specifying that string after +/ or +? before the filename. The string can be made case sensitive and/or caused to be interpreted as a regular expression by inserting c and/or r after the + sign. These search modes can be explicitly disabled by using the uppercase variant of those letters: C and/or R. When the string contains spaces, it needs to be enclosed in quotes. To give an example: to open a file at the first occurrence of the word "Foo", one would do: nano +c/Foo file As a special case: if instead of a filename a dash (-) is given, nano will read data from standard input.
Entering text and moving around in a file is straightforward: typing the letters and using the normal cursor movement keys. Commands are entered by using the Control (^) and the Alt or Meta (M-) keys. Typing ^K deletes the current line and puts it in the cutbuffer. Consecutive ^Ks will put all deleted lines together in the cutbuffer. Any cursor movement or executing any other command will cause the next ^K to overwrite the cutbuffer. A ^U will paste the current contents of the cutbuffer at the current cursor position. When a more precise piece of text needs to be cut or copied, one can mark its start with ^6, move the cursor to its end (the marked text will be highlighted), and then use ^K to cut it, or M-6 to copy it to the cutbuffer. One can also save the marked text to a file with ^O, or spell check it with ^T. On some terminals, text can be selected also by holding down Shift while using the arrow keys. Holding down the Ctrl or Alt key too will increase the stride. Any cursor movement without Shift being held will cancel such a selection. The two lines at the bottom of the screen show some important commands; the built-in help (^G) lists all the available ones. The default key bindings can be changed via a nanorc file -- see nanorc(5).
-A, --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. -B, --backup When saving a file, back up the previous version of it, using the current filename suffixed with a tilde (~). -C directory, --backupdir=directory 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 (-B). The uniquely numbered files are stored in the specified directory. -D, --boldtext For the interface, use bold instead of reverse video. This will be overridden by setting the options titlecolor, statuscolor, keycolor, functioncolor, numbercolor, and/or selectedcolor in your nanorc file. See nanorc(5). -E, --tabstospaces Convert typed tabs to spaces. -F, --multibuffer Read a file into a new buffer by default. -G, --locking Use vim-style file locking when editing files. -H, --historylog Save the last hundred search strings and replacement strings and executed commands, so they can be easily reused in later sessions. -I, --ignorercfiles Don't look at the system's nanorc nor at the user's nanorc. -J number, --guidestripe=number 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 set stripecolor in your nanorc file.) -K, --rawsequences Interpret escape sequences directly (instead of asking ncurses to translate them). If you need this option to get your keyboard to work properly, please report a bug. Using this option disables nano's mouse support. -L, --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.) -M, --trimblanks Snip trailing whitespace from the wrapped line when automatic hard-wrapping occurs or when text is justified. -N, --noconvert Disable automatic conversion of files from DOS/Mac format. -O, --morespace Obsolete and ignored option, since the line below the title bar is included into the editing space by default. If you prefer to keep this line blank, use -e or --emptyline. -P, --positionlog For the 200 most recent files, log the last position of the cursor, and place it at that position again upon reopening such a file. -Q "regex", --quotestr="regex" Set the regular expression for matching the quoting part of a line. The default value is "^([ \t]*([!#%:;>|}]|//))+". (Note that \t stands for an actual Tab.) This makes it possible to rejustify blocks of quoted text when composing email, and to rewrap blocks of line comments when writing source code. -R, --restricted Restricted mode: don't read or write to any file not specified on the command line. This means: don't read or write history files; don't allow suspending; don't allow spell checking; don't allow a file to be appended to, prepended to, or saved under a different name if it already has one; and don't make backup files. Restricted mode can also be activated by invoking nano with any name beginning with 'r' (e.g. "rnano"). -S, --smooth Obsolete and ignored option, since smooth scrolling has become the default. If you prefer the chunk-by-chunk scrolling behavior, use -j or --jumpyscrolling. -T number, --tabsize=number Set the size (width) of a tab to number columns. The value of number must be greater than 0. The default value is 8. -U, --quickblank Do quick status-bar blanking: status-bar messages will disappear after 1 keystroke instead of 25. Note that option -c (--constantshow) overrides this. -V, --version Show the current version number and exit. -W, --wordbounds Detect word boundaries differently by treating punctuation characters as part of a word. -X "characters", --wordchars="characters" Specify which other characters (besides the normal alphanumeric ones) should be considered as part of a word. This overrides option -W (--wordbounds). -Y name, --syntax=name Specify the name of the syntax highlighting to use from among the ones defined in the nanorc files. -Z, --zap Let an unmodified Backspace or Delete erase the marked region (instead of a single character, and without affecting the cutbuffer). -a, --atblanks When doing soft line wrapping, wrap lines at whitespace instead of always at the edge of the screen. -b, --breaklonglines Automatically hard-wrap the current line when it becomes overlong. (This option is the opposite of -w (--nowrap) -- the last one given takes effect.) -c, --constantshow Constantly show the cursor position on the status bar. Note that this overrides option -U (--quickblank). -d, --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. -e, --emptyline Do not use the line below the title bar, leaving it entirely blank. -f file, --rcfile=file Read only this file for setting nano's options, instead of reading both the system- wide and the user's nanorc files. -g, --showcursor Make the cursor visible in the file browser (putting it on the highlighted item) and in the help viewer. Useful for braille users and people with poor vision. -h, --help Show a summary of the available command-line options and exit. -i, --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). -j, --jumpyscrolling Scroll the buffer contents per half-screen instead of per line. -k, --cutfromcursor Make the 'Cut Text' command (normally ^K) cut from the current cursor position to the end of the line, instead of cutting the entire line. -l, --linenumbers Display line numbers to the left of the text area. -m, --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. -n, --noread Treat any name given on the command line as a new file. This allows nano to write to named pipes: it will start with a blank buffer, and will write to the pipe when the user saves the "file". This way nano can be used as an editor in combination with for instance gpg without having to write sensitive data to disk first. -o directory, --operatingdir=directory Set the operating directory. This makes nano set up something similar to a chroot. -p, --preserve Preserve the XON and XOFF sequences (^Q and ^S) so they will be caught by the terminal. -r number, --fill=number Set the target width for justifying and automatic hard-wrapping at this number of columns. If the value is 0 or less, wrapping will occur at the width of the screen minus number columns, allowing the wrap point to vary along with the width of the screen if the screen is resized. The default value is -8. -s "program [argument ...]", --speller="program [argument ...]" Use this command to perform spell checking and correcting, instead of using the built-in corrector that calls hunspell or GNU spell. -t, --tempfile Save a changed buffer without prompting (when exiting with ^X). -u, --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 --noconvert.) -v, --view Just view the file and disallow editing: read-only mode. This mode allows the user to open also other files for viewing, unless --restricted is given too. -w, --nowrap Do not automatically hard-wrap the current line when it becomes overlong. This is the default. (This option is the opposite of -b (--breaklonglines) -- the last one given takes effect.) -x, --nohelp Don't show the two help lines at the bottom of the screen. -y, --afterends Make Ctrl+Right stop at word ends instead of beginnings. -z, --suspend Enable the suspend ability. -$, --softwrap Enable 'soft wrapping'. This will make nano attempt to display the entire contents of any line, even if it is longer than the screen width, by continuing it over multiple screen lines. Since '$' normally refers to a variable in the Unix shell, you should specify this option last when using other options (e.g. 'nano -wS$') or pass it separately (e.g. 'nano -wS -$').
Several of the above options can be switched on and off also while nano is running. For example, M-L toggles the hard-wrapping of long lines, M-S toggles soft-wrapping, M-N toggles line numbers, M-M toggles the mouse, M-I auto-indentation, and M-X the help lines. See at the end of the ^G help text for a complete list.
When --rcfile is given, nano will read just the specified file for setting its options and syntaxes and key bindings. Without that option, nano will read two configuration files: first the system's nanorc (if it exists), and then the user's nanorc (if it exists), either ~/.nanorc or $XDG_CONFIG_HOME/nano/nanorc or ~/.config/nano/nanorc, whichever is encountered first. See nanorc(5) for more information on the possible contents of those files.
If no alternative spell checker command is specified on the command line nor in one of the nanorc files, nano will check the SPELL environment variable for one. In some cases nano will try to dump the buffer into an emergency file. This will happen mainly if nano receives a SIGHUP or SIGTERM or runs out of memory. It will write the buffer into a file named nano.save if the buffer didn't have a name already, or will add a ".save" suffix to the current filename. If an emergency file with that name already exists in the current directory, it will add ".save" plus a number (e.g. ".save.1") to the current filename in order to make it unique. In multibuffer mode, nano will write all the open buffers to their respective emergency files.
The recording and playback of keyboard macros works correctly only on a terminal emulator, not on a Linux console (VT), because the latter does not by default distinguish modified from unmodified arrow keys. Please report any other bugs that you encounter via: https://savannah.gnu.org/bugs/?group=nano. When nano crashes, it will save any modified buffers to emergency .save files. If you are able to reproduce the crash and you want to get a backtrace, define the environment variable NANO_NOCATCH.
nanorc(5) /usr/share/doc/nano/ (or equivalent on your system)