Fc Command

The fc (File Compare) command is a built-in Windows utility that compares two individual files or sets of files and displays the differences between them. It is an essential tool for developers and system administrators to verify file integrity, check for changes in configuration files, or debug code discrepancies.

• /B: Performs a binary comparison. This is useful for executable files or images. The output shows the hexadecimal address of differences.
• /C: Ignores the case of letters. (e.g., "APPLE" and "apple" are considered identical).
• /N: Displays line numbers during an ASCII comparison, making it easier to locate specific changes in text files.
• /W: Compresses white space (tabs and spaces) during comparison. If a line contains many spaces, they are treated as a single space.

1. Basic Text Comparison

Compare two simple text files to see if lines have been added, removed, or changed.

2. Comparing Configuration Files with Line Numbers

When updating software, you often need to check what changed in the configuration. Using /n helps find the exact line.

3. Ignoring Case and Whitespace

Sometimes formatting changes or capitalization shouldn't count as a difference. Use /c and /w.