GNU/Linux Command – SUM

sum — Compute and Check .
`sum’ computes a 16-Bit checksum for each given file(s)/stdin. By default, it computes checksums using an algorithm compatible with BSD `sum’ and prints file sizes in units of 1024-byte blocks.
$ sum file -- Print checksum and block counts.  $ sum file1 file2 -- Print checksum, block counts and filename.  $ sum -r file -- Default. Use BSD sum algorithm (1KB/Block).  $ sum -s file -- Use System V sum algorithm (512 bytes/Block).
Read: man sum

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