VASPkit Configuration File: Using /opt Directory on Linux

To make vaspkit recognize the configuration file in the '/opt' directory, you can set the environment variable VASPKIT_CONFIG to the path of the configuration file.

You can do this by adding the following line to your shell startup file (e.g., '~/.bashrc' or '~/.bash_profile'):

export VASPKIT_CONFIG='/opt/.vaspkit'

After adding this line, save the file and restart your terminal or run the following command to apply the changes:

source ~/.bashrc

Now, when you run vaspkit, it should recognize the configuration file in the '/opt' directory.