.B stest
takes a list of files and filters by the files' properties, analogous to
.IR test (1).
-Files which pass all tests are printed to stdout.
+Files which pass all tests are printed to stdout. If no files are given, stest
+reads files from stdin.
.SH OPTIONS
.TP
.B \-a
.B \-u
Test that files have their set-user-ID flag set.
.TP
+.B \-v
+Invert the sense of tests, only failing files pass.
+.TP
.B \-w
Test that files are writable.
.TP