FreeBSD/src 9809df4 (r351203)usr.sbin/periodic periodic.sh

periodic: replace "tty" with "test -t 0"

Apparently using tty for this purpose has been deprecated since 4.4 Lite.

Reviewed by:    cy
MFC after:      1 month
Differential Revision:  https://reviews.freebsd.org/D21318
DeltaFile
+1-1usr.sbin/periodic/periodic.sh
+1-11 files

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