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# To view the differences between two files:
diff -u version1 version2

# To view the differences between two directories:
diff -ur folder1/ folder2/

# To ignore the white spaces:
diff -ub version1 version2

# To ignore the blank lines:
diff -uB version1 version2

# To ignore the differences between uppercase and lowercase:
diff -ui version1 version2

ignore

  • -B: ignore blank lines
  • -b: ignore whitespace
  • -E: ignore tab expansion
  • -W: ignore trailing spaces
  • -w: ignore all whitespace diffs
  • -I <regex>: ignore regex matches

test

# To report whether the files differ:
diff -q version1 version2

# To report whether the files are identical:
diff -s version1 version2

recursive

# List files
diff -rq folder1/ folder2/

# Show diffs
diff -ENwbur folder1/ folder2/

# Exclude files
diff -rq -x .git -x '*.pyc' folder1/ folder2/