sum--n

cksum (1)            - checksum and count the bytes in a file
cksum (3tcl)         - calculate a cksum(1) compatible checksum
debsums (1)          - check the MD5 sums of installed Debian packages
debsums_gen (8)      - Generate /var/lib/dpkg/info/*.md5sums for packages lacking it
DES_cbc_cksum (3ssl) - DES encryption
DES_quad_cksum (3ssl) - DES encryption
md5sum (1)           - compute and check MD5 message digest
md5sum.textutils (1) - compute and check MD5 message digest
mysqldumpslow (1)    - Parse and summarize the MySQL slow query log.
sa (8)               - summarizes accounting information
sha1sum (1)          - compute and check SHA1 message digest
sha224sum (1)        - compute and check SHA224 message digest
sha256sum (1)        - compute and check SHA256 message digest
sha384sum (1)        - compute and check SHA384 message digest
sha512sum (1)        - compute and check SHA512 message digest
shasum (1) [sha1sum] - compute and check SHA1 message digest
sum (1)              - checksum and count the blocks in a file
sum (3tcl)           - calculate a sum(1) compatible checksum
time (1)             - run programs and summarize system resource usage