Linux中比较两个文件差异，diff命令详解

使用 diff 命令
diff 是Linux中用于比较两个文件差异的标准命令。它会逐行比较两个文件，并输出它们的差异。

示例：
比较文件 file1.txt 和 file2.txt 的差异：
diff file1.txt file2.txt
输出更易于阅读的差异（使用统一格式）：
diff -u file1.txt file2.txt
输出差异，并显示差异所在的行号：
diff -u -p file1.txt file2.txt
忽略空白字符（空格、制表符等）的差异：
diff -b file1.txt file2.txt
忽略所有空白行的差异：
diff -B file1.txt file2.txt