{"id":691,"date":"2012-10-09T08:04:39","date_gmt":"2012-10-09T08:04:39","guid":{"rendered":"https:\/\/www.rosehosting.com\/blog\/?p=691"},"modified":"2022-12-08T04:39:34","modified_gmt":"2022-12-08T10:39:34","slug":"how-to-check-data-integrity-using-md5sum-under-gnulinux","status":"publish","type":"post","link":"https:\/\/www.rosehosting.com\/blog\/how-to-check-data-integrity-using-md5sum-under-gnulinux\/","title":{"rendered":"How to check data integrity using md5sum under GNU\/Linux"},"content":{"rendered":"
<\/div>

\"DataIn this article, we will describe how you can check the integrity of your data using the md5sum<\/strong> utility under the GNU\/Linux operating system.<\/p>\n

What is\u00a0md5sum?<\/strong><\/p>\n

md5sum<\/strong> is a tool generally used to check data integrity. It calculates and verifies 128-bit MD5 hashes<\/strong>, so you could know if a particular file is a valid one or a corrupt one.<\/p>\n

<\/p>\n

For example, let’s create a backup of the whole ‘\/etc’<\/em>\u00a0directory tarred in a ‘tar.gz’<\/em> file containing all the configuration data of the vps<\/a> we’re using in this example:<\/p>\n

# mkdir \/tmp\/example && cd \/tmp\/example<\/pre>\n
# tar -cpzf etc-backup.tar.gz \/etc\/<\/pre>\n
Then use the md5sum\u00a0<\/strong>tool to calculate the hash value of the ‘etc-backup.tar.gz’<\/span>\u00a0archive:<\/p>\n
# md5sum etc-backup.tar.gz\r\n6e0bde8e7a325322417e9782ed8e73f4  etc-backup.tar.gz<\/pre>\n
Ok, now the hexadecimal value is the MD5 hash<\/strong> for our data. How can we use this hash value to check if the integrity of the\u00a0‘etc-backup.tar.gz’<\/span>\u00a0archive is valid and the archive is not modified? It’s quite easy and trivial, so once you’ve downloaded the backup archive:<\/p>\n
# mkdir \/tmp\/downloads && cd \/tmp\/downloads\r\n# wget http:\/\/example.com\/path\/to\/etc-backup.tar.gz<\/pre>\n
you can use the md5sum<\/strong> tool to get the MD5 hash of the archive you’ve just downloaded.<\/p>\n
# md5sum etc-backup.tar.gz\r\n6e0bde8e7a325322417e9782ed8e73f4  etc-backup.tar.gz<\/pre>\n
As you are already noticing, the MD5 hash values are identical<\/strong> which means the file we downloaded is the one we need, is valid and healthy.<\/p>\n
But what if in the meantime, someone \/ something modified the archive, for example let’s clear the backed ‘\/etc\/passwd’<\/span> file and re-create the\u00a0‘etc-backup.tar.gz’<\/span>:<\/p>\n
– extract the archive by executing:<\/p>\n
# tar zxvf etc-backup.tar.gz<\/pre>\n
– clear the\u00a0‘\/etc\/passwd’<\/span> extracted from the archive:<\/p>\n
# > etc\/passwd<\/pre>\n
– create the ‘etc-backup.tar.gz’:<\/p>\n
# tar -cpzf etc-backup.tar.gz etc\/<\/pre>\n
– check file’s integrity:<\/p>\n
# md5sum etc-backup.tar.gz\r\n25e34baa193512242bdee7158cfa2205  etc-backup.tar.gz<\/pre>\n
As you can see the MD5 hashes are different\u00a0<\/strong>
\n(6e0bde8e7a325322417e9782ed8e73f4 !=\u00a025e34baa193512242bdee7158cfa2205)<\/em> for the same exact file. So, this way you can know if your backup archive is valid and healthy.<\/p>\n
And what if you’ve downloaded debian-net installer iso image for example and want to check it against the provided MD5 hashes? You can use the ‘-c’ switch which will read the hashes from the file(s) specified and will check them against the iso images.<\/p>\n
So, to check it run:<\/p>\n
# md5sum -c MD5SUMS 2>\/dev\/null | grep net<\/pre>\n
and you should get:<\/p>\n
debian-6.0.5-amd64-netinst.iso: OK<\/pre>\n
PS.<\/strong><\/span> If you liked this post please share it with your friends on the social networks using the buttons on the left or simply leave a reply below. Thanks.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this article, we will describe how you can check the integrity of your data using the md5sum utility under … <\/p>\n
Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":692,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1703,21],"tags":[116,114,113,27,112,111,1152,115,117,18],"class_list":["post-691","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","category-tips-and-tricks","tag-archive","tag-gnulinux","tag-hash","tag-linux","tag-md5","tag-md5sum","tag-rosehosting","tag-tar","tag-tar-gz","tag-vps","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"yoast_head":"\nHow to check data integrity using md5sum under GNU\/Linux | RoseHosting<\/title>\n<meta name=\"description\" content=\"How to check data integrity using md5sum under GNU\/Linux | RoseHosting\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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