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How does a download user verify md5 after downloading a file?

We may notice that many download sites provide the md5 line. For example, when I load ABC.zip along with the line md5, for example: " 2743a6a9fe6f873df1c7ed8ac91df5d7 *ABC.zip". I know this idea, its digest algorithm, to prevent file forge.

My question is, how does the user calculate the md5 line for ABC.zip and compare it with the value site? Any existing md5 string generator tool?

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It depends a little on your operating system. Most Linux / Unix distributions have a program md5or md5sum.

Example:

# md5sum eclipse-SDK-3.6RC3-linux-gtk.tar.gz
8eca528d2c0b33dae10ba8750b2e4b94  eclipse-SDK-3.6RC3-linux-gtk.tar.gz

, , :

# md5sum -c test.md5
eclipse-SDK-3.6RC3-linux-gtk.tar.gz: OK

(test.md5 )

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Linux md5sum.

BSD- md5.

Windows http://en.wikipedia.org/wiki/Md5sum

, md5sum md5 , MD5, MD5SUM:

sarnold@haig:~/bin$ md5sum * > /tmp/MD5SUM
sarnold@haig:~/bin$ md5sum -c /tmp/MD5SUM
aa-change: OK
aa-change.c: OK
briss: OK
mkvtom2ts: OK
muxer: OK
muxer_orig: OK
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. .

OS X 'md5'. Linux - . , , , - .

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, Cygwin, md5sum.

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