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                [TOC] ## 語法 ``` -B 不檢查空白行。 -i 不檢查大小寫的不同。 -N 在比較目錄時,若文件A僅出現在某個目錄中,預設會顯示: -q 僅顯示有無差異,不顯示詳細的信息。 -r 比較子目錄中的文件。 -u,-U<列數> 以合并的方式來顯示文件內容的不同。 -y 以并列的方式顯示文件的異同之處。 -W<寬度>  在使用-y參數時,指定欄寬。 -c  顯示全部內文,并標出不同之處。 ``` ## 示例 ### 比較兩個文件 ``` > cat testfile_1 HELLO LINUX! LINUX IS A FREE UNIX-TYPE OPTERATING SYSTEM. THIS IS A LINUX TESTFILE! LINUX TEST > cat testfile_2 HELLO WORLD! LINUX IS A FREE UNIX-TYPE OPTERATING SYSTEM. LINUX TEST THIS IS A ADD LINE > diff testfile_1 testfile_2 1c1 < HELLO LINUX! --- > HELLO WORLD! 3d2 < THIS IS A LINUX TESTFILE! 4a4 > THIS IS A ADD LINE ``` ### 并排格式輸出 ``` diff testfile_1 testfile_2 -y -W 100 HELLO LINUX! | HELLO WORLD! LINUX IS A FREE UNIX-TYPE OPTERATING SYSTEM. LINUX IS A FREE UNIX-TYPE OPTERATING SYSTEM. THIS IS A LINUX TESTFILE! < LINUX TEST LINUX TEST > THIS IS A ADD LINE ``` 說明 - "|"表示前后2個文件內容有不同 - "<"表示后面文件比前面文件少了1行內容 - ">"表示后面文件比前面文件多了1行內容 ### `-ruN ` 合并方式顯示 ``` > diff -ruN testfile_1 testfile_2 --- testfile_1 2020-09-22 16:33:46.000000000 +0800 +++ testfile_2 2020-09-22 16:24:54.000000000 +0800 @@ -1,4 +1,4 @@ -HELLO LINUX! +HELLO WORLD! LINUX IS A FREE UNIX-TYPE OPTERATING SYSTEM. -THIS IS A LINUX TESTFILE! -LINUX TEST \ No newline at end of file +LINUX TEST +THIS IS A ADD LINE ``` > 這種輸出方式輸出的內容可以用于使用patch命令進行打補丁包 ### 比較目錄 ``` > mkdir diff1 > mkdir diff2 > cp testfile_1 diff1 > cp testfile_2 diff2 > diff -ruN diff1 diff2 --- diff1/testfile_1 2020-09-22 16:35:33.000000000 +0800 +++ diff2/testfile_1 1970-01-01 08:00:00.000000000 +0800 @@ -1,4 +0,0 @@ -HELLO LINUX! -LINUX IS A FREE UNIX-TYPE OPTERATING SYSTEM. -THIS IS A LINUX TESTFILE! -LINUX TEST \ No newline at end of file diff -ruN diff1/testfile_2 diff2/testfile_2 --- diff1/testfile_2 1970-01-01 08:00:00.000000000 +0800 +++ diff2/testfile_2 2020-09-22 16:35:36.000000000 +0800 @@ -0,0 +1,4 @@ +HELLO WORLD! +LINUX IS A FREE UNIX-TYPE OPTERATING SYSTEM. +LINUX TEST +THIS IS A ADD LINE ```
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