Don Quijote de la Mancha -Miguel de Cervantes-

 

Editor de Textos CLI nano en Linux

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Nano

$ nano

Editor de texto CLI nano, cómo usarlo y cuáles son sus ventajas

 

Editor de texto nano

Siendo así, independientemente de si administras o nó sistemas Linux, es interesante que cualquier usuario de GNU / Linux sepa utilizar al menos uno de estos editores de textos de terminal (nano, vi o vim).

Porque puede ocurrir que en alguna ocasión  no tengas o dispongas de una interfaz gráfica para ayudarte. Además, la realización de tareas desde la terminal puede ser más eficiente que el entorno gráfico.

 

Ventajas de usar el editor de texto nano

Entre los editores de la terminal existentes, nano es un editor fácil y simple de usar, incluso para quien desea iniciarse, empezar o simplemente trabajar con un texto o documento.

Diferente de vi/vim, ofrece recursos que se parecen a los editores de texto y gráficos. Entre ellos, el conjunto de teclas más usadas son visibles en el pie de página del editor.

Además, la manipulación con el texto es fácil: se escribe y edita como si estuvieras en un editor gráfico. Parece un poco obvio, pero en el caso del editor vi el proceso parece ser más complejo.

Cómo instalar el editor de texto nano

El editor nano no viene instalado por defecto en las distribuciones de Linux. Siendo así, es preciso instalarlo a través del comando:

Debian y derivados:

$ sudo apt-get install nano

RedHat y derivados:

$ sudo yum install nano

Fedora:

$ sudo dnf install nano

OpenSUSE:

$ sudo zypper install nano

Una vez instalado, ya puedes crear y editar un archivo de texto:

$ nano <nombredearchivo>

Después, se abrirá el editor de texto con el contenido vacío. Inserta cualquier cosa de tu interés y observa que las teclas [ENTER], [RETROCESO] y [DELETE] funcionan como en un editor de gráficos.

Para finalizar, después de haber insertado o editado el contenido del archivo, es preciso conocer los conjuntos de teclas ofrecidos por nano:

Una muy buena opción es darle un vistazo a su página man (ver a continuación)
 
$ man nano

 

  • [CTRL] tecla Ctrl
$ [CTRL]+[O]: guarda el documento y permite la continuación de la edición.
$ [CTRL]+[X]: cierra el editor de texto. En caso de que no hayas completado el trabajo, guarda el documento ([CTRL]+[O]) y después sal usando la combinación de teclas [CTRL]+[X]. Si no se ha guardado aún, el programa te preguntará si deseas guardar los cambios. Cuando se te pida, escribe “s” (para guardar tu trabajo) y listo.

También notarás, en la parte inferior de la ventana, algunas de las combinaciones de teclas más útiles que pueden ser utilizadas:

$ [CTRL]+[C]: imprime el número de la línea actual.
$ [CTRL]+[K]: corta una línea de texto.
$ [CTRL]+[U]: coloca una línea de texto.
$ [CTRL]+[R]: lee el contenido de otro archivo.

El recurso de cortar es una gran manera de moverse y/o copiar líneas dentro del editor. Cuando se corta una línea, se copia en el buffer nano, y, entonces, coloca esta línea en la ubicación actual del cursor.

En cuanto a la capacidad de lectura del contenido de otro archivo, es muy útil cuando tienes otro archivo que deseas que el contenido de ese archivo se copie en el archivo actual que se abrió en nano. Por último, para obtener más información sobre los conjuntos de teclas de nano, presiona [CTRL]+[G] mientras estás con el editor abierto.


OPTIONS disponibles

$ man nano

-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 back‐
ups 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, status‐
color, 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, --bookstyle
When justifying, treat any line that starts with whitespace as the beginning of a paragraph (unless auto-indenting is on).

-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 his‐
tory 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, --softwrap
Display over multiple screen rows lines that exceed the screen's width. (You can make this soft-wrapping occur at white‐
space instead of rudely at the screen's edge, by using also --atblanks.) (The old short option, -$, is deprecated.)

-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. When using
this option, you probably want to omit -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. (Any line with an anchor additionally gets a mark in the margin.)

-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 combi‐
nation 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.

-q, --indicator
Display a "scrollbar" on the righthand side of the edit window. It shows the position of the viewport in the buffer and
how much of the buffer is covered by the viewport.

-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(1)
or spell(1).

-t, --saveonexit
Save a changed buffer without prompting (when exiting with ^X). (The old form of the long option, --tempfile, is depre‐
cated.)

-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 oppo‐
site 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 and Ctrl+Delete stop at word ends instead of beginnings.

-z, --suspendable
Allow the user to suspend the editor (with ^Z by default).

-%, --stateflags
Use the top-right corner of the screen for showing some state flags: I when auto-indenting, M when the mark is on, L when
hard-wrapping (breaking long lines), R when recording a macro, and S when soft-wrapping. When the buffer is modified, a
star (*) is shown after the filename in the center of the title bar.

-!, --magic
When neither the file's name nor its first line give a clue, try using libmagic to determine the applicable syntax.

 


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