# sha1sum
# Calculate SHA1 cryptographic checksums.
# More information: <https://www.gnu.org/software/coreutils/sha1sum>.
# Calculate the SHA1 checksum for a file:
sha1sum path/to/file
# Calculate SHA1 checksums for multiple files:
sha1sum path/to/file1 path/to/file2
# Calculate and save the list of SHA1 checksums to a file:
sha1sum path/to/file1 path/to/file2 > path/to/file.sha1
# Read a file of SHA1 sums and verify all files have matching checksums:
sha1sum --check path/to/file.sha1
# Only show a message for missing files or when verification fails:
sha1sum --check --quiet path/to/file.sha1
# Only show a message for files for which verification fails, ignoring missing files:
sha1sum --ignore-missing --check --quiet path/to/file.sha1
$
cheat.sh
tldr