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md5sum:tldr:6ad95
The command md5sum --check --quiet ${filename-md5}
is used to check the validity of a file by comparing its MD5 hash value with a pre-calculated MD5 hash value stored in a file.
Here is a breakdown of the command:
-
md5sum
: It is a command-line utility that calculates and outputs the MD5 hash value of a file. It is commonly available on Unix-like operating systems. -
--check
: This option is used to check the MD5 hash value of a file against a pre-calculated value. -
--quiet
: This option is used to makemd5sum
operate in quiet mode, meaning it does not display any output for individual files. -
${filename-md5}
: This is a parameter or variable that should contain the path or filename of a file that contains the pre-calculated MD5 hash value of the file you want to check. The exact format of the file should be a single line with the MD5 hash value followed by the filename.
So, when you execute md5sum --check --quiet ${filename-md5}
, it will read the MD5 hash value and filename from ${filename-md5}
file, compare it with the MD5 hash value calculated for the mentioned file, and provide no output (if the hashes match) or an error message (if the hashes don't match).