开关用错了,看下面红色文字
MD5 -- Calculate MD5 signature of file. Call
with md5
Options:
-csig Check against sig, set exit status 0 = OK
-dtext Compute signature of text argument
-l Use lower case letters for hexadecimal digits
-n Do not show file name after sum
-ofname Write output to fname (- = stdout)
-u Print this message
-v Print version information
by John Walker --
http://www.fourmilab.ch/
Version 2.2 (2008-01-14)
This program is in the public domain.