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+.Dd September 7, 2018
+.Dt REC 1
+.Os "Causal Agency"
+.
+.Sh NAME
+.Nm rec
+.Nd watch files
+.
+.Sh SYNOPSIS
+.Nm
+.Ar
+.Ar command
+.Nm
+.Ar
+.Fl -
+.Ar command
+.Op Ar argument ...
+.
+.Sh DESCRIPTION
+.Nm
+executes the
+.Ar command
+each time a
+.Ar file
+is modified.
+.
+.Sh EXAMPLES
+.Dl rec rec.c make
+.Dl rec rec.c wake.c -- make rec wake
+.
+.Sh CAVEATS
+.Nm
+does not support Linux
+since it uses
+.Xr kqueue 2 .