shasum:tldr:78db0

This command is using the shasum utility to compute the SHA-256 hash of one or more files. Here is a breakdown of the command:

• shasum: This is the command itself, which is used to calculate hash checksums of files.
• --algorithm 256: This flag tells shasum to use the SHA-256 algorithm to compute the hash.
• ${filename1 filename2 ---}: This is a placeholder for the filenames of the files you want to calculate the SHA-256 hash for. You can replace ${filename1 filename2 ---} with the actual filenames separated by spaces. For example, if you have two files named file1.txt and file2.txt, you would replace ${filename1 filename2 ---} with file1.txt file2.txt.
• >: This is a redirect operator that redirects the output of the shasum command to a file.
• ${filename-sha256}: This is a placeholder for the filename of the output file where the SHA-256 hash will be stored. You can replace ${filename-sha256} with the desired filename. For example, if you want to save the hash in a file named hash.txt, you would replace ${filename-sha256} with hash.txt.

In summary, this command calculates the SHA-256 hash for one or more files and saves the output in a file specified by ${filename-sha256}.