How to configure how many lines you can copy from terminal

Hi,

I’ve been trying to research how to configure how many lines I can copy from terminal. Presently I use a combination of:

  • zsh
  • alacritty
  • tmux

The current configuration I have:

  • Alacritty (~/.config/alacritty/alacritty.yml) configured with 10K line history.
  • ZSH (~/.zshrc) with a 1000 lines history.
  • TMUX (~/.tmux.conf) with a 10K history buffer.

Problem:

Yet it appears when I drag and select text from terminal I can’t do more then 200 lines.

I’m wondering what controls how much text I can copy from the terminal?

Do you have some limit set for scrollback?

In gnome-terminal:

I could scroll-copy as many lines as in the output.

Is there some similar settings in your terminals?

for i in {1..500}; do echo $i; done
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>>8:20 ➜ ~ ➜ for i in {1..500}; do echo $i; done

Alacritty + tmux + zsh here works for me :exploding_head: :exploding_head:

printf "%s\n" {1..500}

works too. :wink:

1 Like

@pebcak @xircon

So I ran the test for 500 lines and it successfully copied all the lines. My upper limit in the test I copied 2514 lines.

I don’t have to press CTRL SHIFT C in Alacritty but instead just select with my mouse and drag up to capture the lines. It automatically issues the copy command (which I am not sure is standard or not).

I re-tested in Kitty, where you have to use CTRL SHIFT C to copy. This was successful.

So on a high level the use case where copying is failing is where I do my system update (e.g. sudo pacman -Syu) and then I try to copy all the history so I can review it. In my case I usually update my system once a month so there are lots of lines of text. So perhaps my next step is to copy allot of text (not just lines like in this test) and see if it fails.

Thanks for all your suggestions everyone.

1 Like

Try some journalctl commands for example. Lots of lines!

1 Like

Good Idea. So I was able to copy 647 full lines and then 38 characters in Alacritty.

So it looked like this on the end where some text us cut off:

May 24 17:51:29 mani kernel: Bluetooth: hci0: Intel Bluetooth firmware file: intel/ibt-hw-37.8.10-fw-1.10.3.11.e.bseq
May 24 17:51:29 mani kernel: kauditd_p

If I copy more then 648 lines the copy operation will faill as I will not be able to paste anything.

If I copy and paste from journal in Kitty it will let me capture all of the visible history of 2053 lines. Kitty does not have TMUX configured. This is the configuration file ( ~/.config/kitty/kitty.conf) contents:

# BEGIN_KITTY_THEME
# Dracula
include current-theme.conf
# END_KITTY_THEME

Apparently I am not losing my mind (yet) :sweat_smile::

1 Like

So decided to launch tmux in Kitty. Noticed I could copy 69 lines of text from the journal with my mouse and no more. So at this point I am guessing tmux is related to the odd copy behavior.