Linux Shell Scripting Cookbook - Third Edition

How it works...

The syntax for the md5sum checksum calculation is as follows:

$ md5sum file1 file2 file3 ..

When multiple files are used, the output will contain a checksum for each of the files, one checksum report per line:

[checksum1]   file1
[checksum1]   file2
[checksum1]   file3

The integrity of a file can be verified with the generated file, like this:

$ md5sum -c file_sum.md5
# It will output a message whether checksum matches or not

If we need to check all the files using all .md5 information available, use this:

$ md5sum -c *.md5

SHA-1 is another commonly used checksum algorithm. It generates a 40-character hex code from the input. The sha1sum command calculates an SHA-1 checksum. Its usage is similar to md5sum. Simply replace ...