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-rw-r--r--usr.bin/biff/biff.17
1 files changed, 7 insertions, 0 deletions
diff --git a/usr.bin/biff/biff.1 b/usr.bin/biff/biff.1
index 49d711d..4a5ca9c 100644
--- a/usr.bin/biff/biff.1
+++ b/usr.bin/biff/biff.1
@@ -47,6 +47,13 @@ The
utility informs the system whether you want to be notified when mail arrives
during the current terminal session.
.Pp
+Affected is the first terminal associated with the standard input,
+standard output or standard error file descriptor, in that order.
+Thus, it is possible to use the redirection facilities of a shell to
+toggle the notification for other terminals than the one
+.Nm
+runs on.
+.Pp
The following options are available:
.Bl -tag -width indent
.It Cm n
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