MD5 Checksum - Linux

• Tool: md5sum

Generate MD5 checksum

Generate a 10M file for test propose.

• # dd if=/dev/zero of=/tmp/test-10M bs=1048576 count=10
• 10+0 records in
• 10+0 records out
• 10485760 bytes (10.0MB) copied, 0.063248 seconds, 158.1MB/s

• # ls -la
• test-10m

Generate MD5checksum

• # cd /tmp
• # md5sum test-10M > test-10M.md5

• # ls -la
• test-10M
• test-10M.md5

• # cat test-10M.md5
• f1c9645dbc14efddc7d8a322685f26eb  test-10M

Verify MD5 checksum

Copy test file (test-10m & test-10m.md5) to USB flash

• # mount -t vfat /dev/sda1 /usb
• # cp -rf test-10M test-10M.md5 /usb

• # ls -la /usb
• test-10M
• test-10M.md5

Verify test file in MD5checksum

• # cd /usb
• # md5sum -c test-10m.md5
• test-10M:  OK