Error handling improvements:

• Added explicit error handling when writing output lines to log files in both terraformWithFilter and terraformWithProgress, returning an error if writing fails. [1] [2]
• Changed file closing logic to handle and report errors during file closure, printing a message to os.Stderr if closing fails in terraformWithProgress, and safely ignoring errors in terraformWithFilter. [1] [2]

Code simplification:

• Refactored output reading loops in both functions to use a simpler for !isEof construct, removing unnecessary break statements and improving readability. [1] [2]