[ diff_options ] file1
[ file2 ]
.SH DESCRIPTION
+.P
.I Zcmp
and
.I zdiff
.I cmp
or
.IR diff "."
-If only 1 file is specified, then the files compared are
-.I file1
-and an uncompressed
-.IR file1 ".gz."
-If two files are specified, then they are uncompressed if necessary and fed to
+If only one file is specified, then it is compared to a file with the same name
+without the
+.I ".gz"
+extension. If two files are specified, then they are uncompressed if necessary
+and fed to
.I cmp
or
.IR diff "."
or
.I diff
is preserved.
+.P
+When both files must be uncompressed before comparison, the second is
+uncompressed to
+.IR "/tmp" "."
+In all other cases,
+.IR "zdiff" " and " "zcmp"
+use only a pipe.
.SH "SEE ALSO"
cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1), gzip(1), gzexe(1)
.SH BUGS