Ensure Script Compatibility Across Different Bash Versions

[cubxxw]

Replaced the -v operator with a more universally compatible method for variable checking in the bash script. The update uses parameter expansion to check if a variable is set, ensuring the script runs smoothly on environments with different Bash versions.

Issue: #1182

🔍 What type of PR is this?

/kind bug

👀 What this PR does / why we need it:

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

🅰 Which issue(s) this PR fixes:

Fixes #1182

What Has Changed

• Updated the method used to check if a variable is set within the bash script. Previously, the -v operator was used which is not supported in some Bash versions, leading to an error in certain environments.

Why Change It

• The use of the -v operator can lead to errors in environments using an older Bash version or different shells, hampering the script's reliability and portability.
• Implementing a more universally compatible variable checking method allows our script to operate consistently across various environments, increasing its robustness and usability.

How the Change Has Been Implemented

• Replaced instances of the -v operator with a more traditionally compatible method, using parameter expansion.

Test and Verification

• The updated script has been tested in environments with different Bash versions to ensure compatibility and functionality.

Example:

# Replacing:
# if [[ ! -v COLOR_OPEN ]]; then

# With:
if [ -z "${COLOR_OPEN+x}" ]; then
    COLOR_OPEN=1
fi

Linked Issue: [If there’s an associated issue/ticket, reference it here]

Testing Procedures: Provide detailed instructions on how the changes have been tested and verified. Specify environments, tools, and scenarios used for testing.

Screenshots: Include any screenshots or GIFs if they provide relevant visual context.

Additional Context: Add any other context or information to help reviewers understand the changes and their impact.