Read a file of SHA1 sums and verify all files have matching checksums

Calculate SHA1 cryptographic checksums.
More information: <https://www.gnu.org/software/coreutils/sha1sum>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

sha1sum --check {{path/to/file.sha1}}

click the source code to copy install sha1sum on any operating system with command-not-found.com