How to test if hyprland is running

[swwind]

Hello, I want to write a script to launch Hyprland after I login in tty, but I can not find a nice way to test whether if hyprland is running or not. And I end up writing this:

# ~/.zprofile
if [[ $(hyprctl monitors) == "HYPRLAND_INSTANCE_SIGNATURE was not set! (Is Hyprland running?)" ]]; then
  exec Hyprland
fi

This looks not very beautiful, so I would like to ask if there is a better way to achieve this.

P.S. this script works very well, I just think it is not so beautiful and elegant.

[vaxerski]

printenv HYPRLAND_INSTANCE_SIGNATURE

[swwind]

Thanks, but I found a new problem when I switch to another tty:

• I launched hyprland on tty2, everything works well.
• I switched to tty3, hyprland launched again. (printenv HYPRLAND_INSTANCE_SIGNATURE also fails)
• Then I have two independent hyprland sessions now.

Both my method and printenv HYPRLAND_INSTANCE_SIGNATURE does not check if there is another existing hyprland session on other TTYs.

[swwind]

Ok, I can check my tty number and make my script only works on tty1, and all things works now.