Updated Concepts (markdown)

Concepts.md

@@ -284,6 +284,36 @@ Notes:
 1. You can only use either `%j` or `%J` inside a single command. If both are encountered the prompt will close. No command will be executed.
 2. When using `%J` `nnn` won't quote the file paths from selection. Quoting `%J` will just place quotes around the entire selection, it won't quote each item individually.
 
+#### Copy command from spawned shell to native command prompt
+
+The prompt (non-readline `nnn`-internal one) can remember the last executed command. Sometimes it may be desirable copy a command from shell history to the prompt. Keybinds can be configured to copy a command from bash/zsh prompt to the system clipboard. You can use these at the subshell prompt and paste the command at the prompt with <kbd>Ctrl-Shift-V</kbd>.
+
+```bash
+# bash: add in ~/.bashrc
+# copy current line to clipboard with ^]
+
+if [[ -n $DISPLAY ]]; then
+    copy_line_to_x_clipboard () {
+        printf %s "$READLINE_LINE" | xsel -ib
+    }
+    bind -x '"\C-]": copy_line_to_x_clipboard'
+fi
+```
+
+```zsh
+# zsh: add in ~/.zshrc
+# copy current line to clipboard with ^U
+
+if [[ -n $DISPLAY ]]; then                                                                                    
+    x-kill-whole-line () {                                                                                    
+      zle kill-whole-line                                                                                     
+      print -rn -- "$CUTBUFFER" | xsel -ib                                                                    
+    }                                                                                                         
+    zle -N x-kill-whole-line                                                                                  
+    bindkey '\C-u' x-kill-whole-line                                                                          
+fi 
+```
+
 ## Design
 
 `nnn` (the core C utility) is, generally speaking, _feature-restricted_. It includes features which you _really_ need so it can remain light enough to finish your workflow accurately before your train of thought is lost.