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There are multiple ways to restart or reboot IntelliJ on Linux using the command line. Here are a few methods:

Method 1: Using kill command

1. Open the terminal on your Linux machine.
2. Run the command "ps aux | grep IntelliJ" to list all running IntelliJ processes.
3. Note down the process ID (PID) of the IntelliJ process you want to restart.
4. Run the command "kill -9 PID" to kill the process forcefully.
5. Now, launch IntelliJ again using the standard method. It will start with a clean slate.

Method 2: Using the built-in restart command

1. Open IntelliJ and go to Help > Find Action (or press Ctrl-Shift-A on your keyboard).
2. In the search bar, type "Restart".
3. Select "Restart IntelliJ IDEA" from the suggested options.
4. IntelliJ will close and then reopen with a fresh state.

Method 3: Using the command line options

1. Open the terminal on your Linux machine.
2. Navigate to the directory where IntelliJ is installed using "cd" command (e.g., "cd /opt/idea-IC-211.7442.40/bin/").
3. Run the command "./idea.sh -r" to restart IntelliJ.
4. Alternatively, you can run the command "./idea.sh -h" to display all available command-line options and choose the appropriate one.

Note: You may need to replace the IntelliJ version number and installation directory in the above commands with the one on your system.