add cmp, thanks stateless

cmp.1

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+.TH CMP 1 sbase\-VERSION
+.SH NAME
+CMP \- compare two files
+.SH SYNOPSIS
+.B cmp
+.RB [ \-ls ]
+.RI file1
+.RI file2
+.SH DESCRIPTION
+.B cmp
+compares two files byte by byte. If the files differ, cmp prints the byte and
+line number at which the difference occurred.
+.P
+The status code is 0 if the files are identical, and 1 if not.  If an error
+occurred the status code is 2.
+.SH OPTIONS
+.TP
+.B \-l
+prints the byte number, and the differing bytes (in octal), for each difference.
+.TP
+.B \-s
+prints nothing, only returns status.
+.SH SEE ALSO
+.IR comm (1),
+.IR diff (1)