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sha512sum:tldr:380b6
This command is using the sha512sum command-line tool to check the integrity of a file using SHA-512 cryptographic hash algorithm. Let's break down the command:
-
sha512sum
: It is the actual command that calculates and displays the SHA-512 checksum of a file. -
--check
: This option is used to check the checksums of the provided files. It compares the calculated checksum with the checksum stored inside the file, which should be in the format:<checksum> <filename>
. -
--quiet
: This option makes the command run silently without any unnecessary output. It suppresses the display of individual checksums while checking multiple files. -
${filename-sha512}
: This is a variable reference that is expected to be replaced with the actual name of the file with its associated SHA-512 checksum. The syntax${variable-name-default}
specifies that if the value offilename
is not set or null, the default valuesha512
will be used.
To summarize, the command is used to verify the integrity of a file using its associated SHA-512 checksum, suppressing unnecessary output.