(nano.info)Feature Toggles

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6 Feature Toggles
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Toggles allow you to change on-the-fly certain aspects of the editor
which would normally be specified via command-line options.  They are
invoked via Meta-key sequences (Note: Commands for more info).  The
following global toggles are available:

‘Constant Cursor Position Display’
     ‘Meta-C’ toggles the ‘-c’ (‘--constantshow’) command-line option.

‘Smart Home Key’
     ‘Meta-H’ toggles the ‘-A’ (‘--smarthome’) command-line option.

‘Auto Indent’
     ‘Meta-I’ toggles the ‘-i’ (‘--autoindent’) command-line option.

‘Cut From Cursor To End-of-Line’
     ‘Meta-K’ toggles the ‘-k’ (‘--cutfromcursor’) command-line option.

‘Long-Line Wrapping’
     ‘Meta-L’ toggles the ‘-w’ (‘--nowrap’) command-line option.

‘Mouse Support’
     ‘Meta-M’ toggles the ‘-m’ (‘--mouse’) command-line option.

‘Tabs To Spaces’
     ‘Meta-O’ toggles the ‘-E’ (‘--tabstospaces’) command-line option.

‘Whitespace Display’
     ‘Meta-P’ toggles the displaying of whitespace (Note: Whitespace).

‘Smooth Scrolling’
     ‘Meta-S’ toggles the ‘-S’ (‘--smooth’) command-line option.

‘Expert/No Help’
     ‘Meta-X’ toggles the ‘-x’ (‘--nohelp’) command-line option.

‘Color Syntax Highlighting’
     ‘Meta-Y’ toggles color syntax highlighting (if your nanorc defines
     syntaxes — Note: Syntax Highlighting).

‘Suspension’
     ‘Meta-Z’ toggles the ‘-z’ (‘--suspend’) command-line option.

‘Line Numbers’
     ‘Meta-#’ toggles the ‘-l’ (‘--linenumbers’) command-line option.

‘Soft Wrapping’
     ‘Meta-$’ toggles the ‘-$’ (‘--softwrap’) command-line option.