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+.TH ZCMP 1
+.SH NAME
+zcmp, zdiff \- compare compressed files
+.SH SYNOPSIS
+.B zcmp
+[ cmp_options ] file1
+[ file2 ]
+.br
+.B zdiff
+[ diff_options ] file1
+[ file2 ]
+.SH DESCRIPTION
+.I  Zcmp
+and 
+.I zdiff
+are used to invoke the
+.I cmp
+or the
+.I diff
+program on compressed files.  All options specified are passed directly to
+.I cmp
+or
+.IR diff "."
+If only 1 file is specified, then the files compared are
+.I file1
+and an uncompressed
+.IR file1 ".Z."
+If two files are specified, then they are uncompressed (if ending with ".Z")
+and fed to
+.I cmp
+or
+.IR diff "."
+The exit status from 
+.I cmp
+or
+.I diff
+is preserved.
+.SH "SEE ALSO"
+cmp(1), diff(1), zmore(1), zcat(1), compress(1), uncompress(1)
+.SH BUGS
+Messages from the
+.I cmp
+or
+.I diff
+programs refer to temporary filenames instead of those specified.