V3/usr/man/man1/cmp.1

Find at most related files.
including files from this version of Unix. 
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NAME		cmp -- compare two files
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SYNOPSIS	cmp___ file918 file928
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DESCRIPTION	The two files are
compared for identical contents.
Discrepancies are noted
by giving the offset and the differing words,
all in octal.
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FILES		--
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SEE ALSO	proof(I)
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DIAGNOSTICS	Messages
are given for inability to open either argument, premature
EOF on either argument, and incorrect usage.
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BUGS		If
the shorter of the two files is of odd length,
cmp acts as if a null byte had been appended to it.