-(2) Compute this file's MD5 checksum and optionally also its SHA1 checksum.
- gpg --print-md md5 $output (or use md5sum)
- gpg --print-md sha1 $output (or use sha1sum)
+(2) Compute this file's SHA1 checksum and optionally also its SHA256 checksum.
+ gpg --print-md sha1 $output (or use sha1sum)
+ gpg --print-md sha256 $output (or use sha256sum)