GNU diff can treat lowercase letters as equivalent to their uppercase counterparts, so that, for example, it considers 'Funky Stuff', 'funky STUFF', and 'fUNKy stuFf' to all be the same. To request this, use the '-i' or '--ignore-case' option. For more documentation, see the following.
- Hunks
- Suppressing Differences in Blank and Tab Spacing
- Suppressing Differences in Blank Lines
- Suppressing Lines Matching a Regular Expression
- Summarizing Which Files Differ
- Binary Files and Forcing Text Comparisons
- diff Output Formats
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