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