sha1sum

Calculate SHA1 cryptographic checksums.

• Calculate the SHA1 checksum for a file:

sha1sum {{filename1}}

• Calculate SHA1 checksums for multiple files:

sha1sum {{filename1}} {{filename2}}

• Calculate and save the list of SHA1 checksums to a file:

sha1sum {{filename1}} {{filename2}} > {{filename.sha1}}

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

sha1sum --check {{filename.sha1}}

• Only show a message for files for which verification fails:

sha1sum --check --quiet {{filename.sha1}}