linux md5sum 命令詳解

1、命令詳解

$ md5sum --help usage: md5sum [option]... [file]... print or check md5 (128-bit) checksums. with no file, or when file is -, read standard input. -b, --binary read in binary mode -c, --check read md5 sums from the files and check them --tag create a bsd-style checksum -t, --text read in text mode (default) the following three options are useful only when verifying checksums: --quiet don't print ok for each successfully verified file --status don't output anything, status code shows success -w, --warn warn about improperly formatted checksum lines --strict with --check, exit non-zero for any invalid input --help display this help and exit --version output version information and exit the sums are computed as described in rfc 1321. when checking, the input should be a former output of this program. the default mode is to print a line with checksum, a character indicating input mode ('*' for binary, space for text), and name for each file. report md5sum bugs to [email protected]

gnu coreutils home page: general help using gnu software: for complete documentation, run: info coreutils 'md5sum invocation'

-b, --binary：以二進位制方式讀取檔案

-t, --text ：預設配置，以文字方式讀取檔案

這兩種方式的輸出結果相同，測試例子如下：

$ md5sum hello.c 6a29375b3e989a04355ecee250448c6e hello.c $ md5sum -b hello.c 6a29375b3e989a04355ecee250448c6e *hello.c $ md5sum a.out 40a9477fa25a9df86361571dd60feffc a.out $ md5sum -b a.out

40a9477fa25a9df86361571dd60feffc *a.out

-c, --check：從指定文字中讀取md5值，然後檢測md5值對應的檔案是否完整，這個「指定文字」的格式如下：

40a9477fa25a9df86361571dd60feffc  a.out

就是在計算檔案md5值時的輸出結果，使用例子如下：

$ md5sum a.out > md5.txt $ cat md5.txt 40a9477fa25a9df86361571dd60feffc a.out $ md5sum -c md5.txt

a.out: ok

當檢查出錯誤時的列印資訊如下

$ md5sum -c md5.txt a.out: failed

md5sum: warning: 1 computed checksum did not match

–tag：安裝bsd樣式輸出結果

$ md5sum --tag a.out 
md5 (a.out) = 40a9477fa25a9df86361571dd60feffc

下面三個選項，只有在檢查md5值（-c）時有效，即和-c一起使用，否則會報錯：

$ md5sum --quiet md5.txt md5sum: the --quiet option is meaningful only when verifying checksums

try 'md5sum --help' for more information.

–quiet：如果檢查md5值成功，不再列印ok

$ md5sum -c md5.txt a.out: ok //成功時沒有輸出： $ md5sum --quiet -c md5.txt //失敗才列印，錯誤資訊 $ md5sum -c md5.txt a.out: failed md5sum: warning: 1 computed checksum did not match $ md5sum --quiet -c md5.txt a.out: failed

md5sum: warning: 1 computed checksum did not match

–status：不列印任何資訊，執行結果以狀態碼形式輸出

//失敗情況 $ md5sum --status -c md5.txt $ echo $? 1//成功情況 $ md5sum --status -c md5.txt $ echo $?

0

-w, --warn ：如果檢測文字中有，非法的行，不符合md5sum -c需要的格式，則列印出警告資訊

$ md5sum --warn -c md5.txt a.out: ok md5sum: md5.txt: 2: improperly formatted md5 checksum line

md5sum: warning: 1 line is improperly formatted

–strict：對於無效的輸入，都返回非零狀態（不知道怎麼用）

–help：幫助資訊

–version：版本資訊

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