The "sha1sum" command:
Usage: fossil sha1sum FILE...
Compute an SHA1 checksum of all files named on the command-line. If a file is named "-" then take its content from standard input. Options:
- -h, --dereference
- If FILE is a symbolic link, compute the hash on the object that the link points to. Normally, the hash is over the name of the object that the link points to.