Hashing tools

Updated: 26 February 2025

Hash a file

md5sum filename
shasum filename
sha1sum filename
sha256sum filename
openssl sha256 filename

Hash the string foo from the command line

echo -n foo | md5sum

Create a handy 8 character, unique string

echo -n $(uuidgen) | sha1sum | cut -c1-8

Verify the checksum of a download, reading from stdin and using the 256 algorithm

echo "long-hash-here *ubuntu-24.04-desktop-amd64.iso" | shasum -a 256 --check

Create a hash of file foo.bar

shasum -a 256 foo.bar