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b2sum:tldr:35169
The command "b2sum --check ${filename-b2}" is used to verify the integrity of a file using the b2sum algorithm. Here's an explanation of each part:
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"b2sum" is the name of the command or program being executed. It is a utility that calculates and verifies checksums using the b2sum algorithm.
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"--check" is an option or flag used to specify that the program should perform a check or verification operation. In this case, it instructs b2sum to check the file's checksum.
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"${filename-b2}" is a variable enclosed in curly braces. It refers to the name of the file for which the checksum needs to be checked. The "-b2" portion is a modification applied to the filename. It likely indicates that the original filename has been modified to append "-b2" to it.
By executing this command, the b2sum program will calculate the checksum of the file with the name specified by the variable "${filename-b2}". It will then compare this checksum with the expected or previously calculated value to determine if the file's integrity has been maintained or if any data corruption has occurred.