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

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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
This commit is contained in:
Alan Somers 2019-08-19 01:14:11 +00:00
parent 311208bdda
commit 9809df467b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=351203
1 changed files with 1 additions and 1 deletions
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usr.sbin/periodic/periodic.sh
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@ -84,7 +84,7 @@ else
# remove the file.
remove_periodic_anticongestion_file=no
fi
if tty > /dev/null 2>&1; then
if [ -t 0 ]; then
export PERIODIC_IS_INTERACTIVE=1
fi
tmp_output=`mktemp ${TMPDIR:-/tmp}/periodic.XXXXXXXXXX`