sha1sum

Calculate SHA1 cryptographic checksums. More information: https://www.gnu.org/software/coreutils/sha1sum.

• Calculate the SHA1 checksum for one or more 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

• Calculate a SHA1 checksum from stdin:

command | sha1sum

• Read a file of SHA1 sums and filenames 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 when verification fails, ignoring missing files:

sha1sum --ignore-missing --check --quiet path/to/file.sha1