tldr/pages/linux/sha1sum.md

sha1sum

Calculate SHA1 cryptographic checksums

• Calculate the SHA1 checksum for file(s) or files in a directory, one checksum per file

sha1sum {{filename1}} sha1sum {{filename1}} {{filename2}} sha1sum {{directory/\*}}

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

sha1sum -c {{filename.sha1}}