How to select (copy) an output in terminal without mouse

Using tmux:

I use tmux in vi mode:

1. Go to copy mode (in my config Prefix+escape, Default Prefix is Ctrl+b)
   • In config file (~/.tmux.conf): bind Escape copy-mode
2. Move around (Using arrows)
3. Select your desire output (Start selection with Space)
   • In my config v: bind-key -T copy-mode-vi y send-keys -X begin-selection
4. Press Enter to copy the text.
   • In my config y: bind-key -T copy-mode-vi y send-keys -X copy-selection
5. Press Prefix+p to Paste.

Also create a key binding like this:

bind C-c run "tmux save-buffer - | xsel -bi"

So you can save the buffer into system clipboard by pressing Prefix+Ctrl+c.

I have add my configuration cause it's more like vim than default config.

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Using commands:

Here is what I do:

1. Run the command (eg: ls -1)
2. Process the output to get my desired result
3. Pip it to xsel -bi

In your example:

$ ls -1 | sed -n 2p | xsel -bi

• ls -1 prints the outputs each in one line
• sed -n 2p get the second line
• xsel has been used to copy the final result in clipboard.

If the command takes too long to run, first save the output to a file the process the output:

command > output
head -10 output | whatever | xsel -bi